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FOCUSED REVIEW article
Music and emotion—a case for north indian classical music.
This article mentions parts of:
Emotional responses to Hindustani raga music: the role of musical structure
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- Language Literacy and Music Laboratory, National Brain Research Centre, Manesar, India
The ragas of North Indian Classical Music (NICM) have been historically known to elicit emotions. Recently, Mathur et al. (2015) provided empirical support for these historical assumptions, that distinct ragas elicit distinct emotional responses. In this review, we discuss the findings of Mathur et al. (2015) in the context of the structure of NICM. Using, Mathur et al. (2015) as a demonstrative case-in-point, we argue that ragas of NICM can be viewed as uniquely designed stimulus tools for investigating the tonal and rhythmic influences on musical emotion.
Introduction
Music is the art of sound in time, organized to the principles of pitch, rhythm, and harmony ( Limb and Braun, 2008 ). An important function of music is its capacity to communicate emotions ( Tanner and Budd, 1985 ), a view that has been agreed upon by both music performers ( Laukka, 2004 ) and music listeners ( Juslin and Laukka, 2004 ). Indeed, almost all known forms of music have been recognized for their affective emotional qualities ( Goldstein, 1980 ). However, the exact causal mechanisms by which musical sounds generate emotions are still unclear. Current models posit that specific acoustic factors embedded in a music signal exploit the physical environment, the cognitive and perceptual processing systems, and the structure of the auditory system, to generate emotional responses ( Huron, 2006 ; Thompson and Schellenberg, 2006 ).
Though the link between music and emotion has been empirically established ( Juslin and Sloboda, 2011 ), most findings lack generalizability across multi-cultural representations of music. Consequently, while music and emotion studies have standardized the use of Western Classical music as a staple source of stimuli, only a handful have incorporated genres of music native to other cultures. This not only precludes interpretations of universality in musical emotions from their findings, it also overlooks musical stimuli which might have advantages as tools for studying musical emotion ( Thompson and Balkwill, 2010 ). The goal of this review is to make such a case for the unique experimental utility offered by North Indian Classical Music (NICM).
In particular, this review will highlight and expand upon the findings of Mathur et al. (2015) , to demonstrate that NICM comprises of stimuli that not only permit the study of music and emotional response, but are also uniquely designed stimulus tools to investigate how specific psychophysical features like tonality and rhythm modulate musical emotion as separable factors.
North Indian Classical music (NICM), or Hindustani music , is an ancient musical form of India that emerged from a cultural synthesis of the Vedic chant tradition and traditional Persian music ( Kaufmann, 1965 ). The central notion in this system of music are ragas , which are described as musical compositions capable of inducing specific moods or emotions. Past studies have investigated ragas and have shown that distinct ragas elicit distinct emotions ( Balkwill and Thompson, 1999 ; Chordia et al., 2008 ; Wieczorkowska et al., 2010 ). In a study published recently, Mathur et al. (2015) exploited a novel feature of raga stimuli, namely that of different presentation modes, differing in tempo/rhythm but matched in tonal structure, to study music and emotion. They found that when the same raga was presented in distinct presentation modes participants reported elicited emotions with varying levels of arousal. They also found that specific tonal combinations emerged as reliable predictors of emotions that participants reported feeling. These findings indicated that the ragas of NICM not only served as interesting and useful acoustic stimuli that could be exploited to study emotion, but also that the structure of the ragas permitted a systematic, controlled investigation of the role of specific features, namely tonality and rhythm in modulating emotions felt by listeners.
KEY CONCEPT 1. Raga Modal melodies comprising the canon of North Indian Classical Music. Each raga is constructed from five or more musical notes, organized into one ascending sequence, and one descending sequence of notes, which together comprise a single melodic framework. Performance of a raga is restricted within the note sequences of its ascending and descending halves, but is improvised in all other respects (e.g., timing between notes; sustain, attack of each note).
In this review we expand upon these findings, and make the case that NICM is tailor-made for disentangling tonal and temporal influences on musical emotion, and thus an invaluable stimulus tool worth bringing to the attention of researchers in all cultural contexts. Specifically, we will build evidence to support that NICM provides (1) a catalog of systematically varying emotion valence, best reflected in the Circle of Thaats (described below); and (2) a form of musical stimulus which has embedded in its very structure an experimentally controlled manipulation of rhythm and tempo keeping tonality constant, allowing for the disentanglement of tonal from rhythmic influences on emotion.
KEY CONCEPT 2 . Circle of Thaats The Circle of Thaats organizes the ten canonical thaats into a system of incremental variation in tonal ratio (#minor/#Major), with clockwise movement adding Major intervals, and counterclockwise movement subtracting minor intervals. Our lab has previously demonstrated the correlation between emotional valence and tonal ratio in Mathur et al. (2015) . For researchers, the Circle can be used as a “dial” for be systematically and gradually manipulating valence.
The review is organized as follows: We begin with the concepts of consonance and dissonance, one of the primary means by which subjective impressions and emotional responses to music arise predictably from frequency ratios between different notes. We then provide an overview of the NICM system, in which different combinations of consonances and dissonances, in the form of tonal intervals, comprise a canon of melodic themes, as the aforementioned ragas , with prescribed emotional functions. We then segue to an overview of Mathur et al. (2015) , which showed that distinct emotional experiences are reported by listeners for each raga , and expand upon these findings by demonstrating that these inter- raga emotion differences vary systematically and predictably as a function of minor-to-major tonal interval ratios. Finally, we generalize the findings of Mathur et al. to argue that the structure of NICM is well-positioned for empirical studies of the subtleties and universality of emotions communicated through sound.
On a final introductory note, throughout the discussion that follows we refer to musical emotions as being elicited, induced, etc. in listeners, as opposed to using terms like perceived or identified. This choice of terminology is intentional, as the study by Mathur et al. (2015) which motivated this review was explicitly in the latter camp of the debate between cognitivists and emotivists. The cognitivist view is that listeners do not actually feel emotions when they listen to music, they perceive the emotions being expressed ( Kivy, 1989 ). Emotivists, on the other hand, argue that music truly induces emotions, such that a happy tune elicits the same autonomic nervous system responses as any other happy experience ( Scherer and Zentner, 2001 ; Sloboda and Juslin, 2010 ). For a complete overview of how music elicits emotion, see Juslin and Västfjäll (2008) , who provide an extensive review and model for what they argue are the six mechanisms by which music induces emotion: brain stem reflexes, conditioning, visual imagery, contagion, episodic memory, and expectancies fulfilled or denied.
Consonance, Dissonance, and Tonal Intervals—from Quantitative Sound Qualities, to Qualitative Musical Impressions
Once a musical note leaves an instrument or vocal tract, its timbre, and pitch produce minute fluctuations in air pressure around the listener, triggering electrophysiological impulses in the cochlea which then travel through the brain stem and midbrain en route to specialized subregions of the auditory cortex, where they are imbued with emotional interpretation and memory by higher cognitive processes in the orbitofrontal region of the prefrontal cortex ( Zatorre, 2005 ). It is in this way that objective physical changes in an acoustic signal induce psychological effects as subjective and abstract as feelings, turning acoustic features into psychoacoustic phenomena ( Juslin, 1997 ; Laukka et al., 2013 ). Communication of the intended emotion, then, depends upon the musician/composer encoding the emotion in acoustic cues, and the listener successfully decoding these acoustic features from psychophysiological stimulation to emotional meaning. Of the various acoustic cues embedded in music, consonance is the most frequently cited as central to influencing emotion perception. Subjectively speaking, consonance and dissonance describe a level of sweetness/harshness of the sound ( Zentner and Kagan, 1998 ). In terms of the aforementioned encoding/decoding communication between composer and listener, consonance encodes a sense of resolution into a composition, dissonance a sense of unresolved tension ( Limb, 2006 ). Indeed, Kamien (2008 , p. 41) describes consonance and dissonance qualitatively stating that “A stable tone combination is a consonance; consonances are points of arrival, rest, and resolution. An unstable tone combination is a dissonance; its tension demands an onward motion to a stable chord. Thus dissonant chords are “active;” traditionally they have been considered harsh and have expressed pain, grief, and conflict.”
Studies have confirmed the presence of an innate preference for consonance over dissonance, even in infant populations ( Schellenberg and Trehub, 1996 ; Juslin and Zentner, 2002 ). Early investigations of the human auditory system revealed that the human ear can disentangle the harmonic overtones of a series if they are separated by a critical bandwidth ( Plomp and Mimpen, 1968 ). The ability of the auditory nerve fibers to resolve closely spaced frequencies, then, leads to subjective impressions of pleasant sounds or consonance, whereas the inability to clearly resolve closely spaced frequencies resulted in the impression of dissonance or a “harsher” sound ( Von Helmholtz, 1912 ; Plomp and Levelt, 1965 ).
Musically speaking, the range of consonance and dissonance that result from different bandwidths is determined by tonal intervals ( Plomp and Levelt, 1965 ). The tonal interval is determined by two tones, one of which is conventionally the tonic ( Parncutt and Hair, 2011 ). The tonic is the root note around which a musical piece is organized, providing a reference for each tone that is sounded during the performance. Tonal intervals produce impressions of consonance if the frequency differences exceed the critical bandwidth ( Plomp and Levelt, 1965 ).
In Parncutt and Hair's (2011) deconstruction of consonance and dissonance, they argue that the two are not in fact diametrically opposed musical phenomena, as they arise from different relationships between tones in a piece of music, some of which are “vertical,” others “horizontal,” in terms of their placement in staff notation. Simultaneously played tones (e.g., as in a chord) have a vertical relationship, whereas the tonal differences between notes or chords separated temporally (e.g., as in a melody) have a horizontal relationship (p. 139): “In a holistic approach, consonance can be promoted by spectral harmonicity (vertical), harmonic proximity or pitch commonality (horizontal), and familiarity (both vertical and horizontal); dissonance by roughness (vertical) and linear pitch distance (horizontal).” Whilst this less dichotomous definition of consonance and dissonance is somewhat specific to Western music (NICM does not rely on the harmonic progressions of chords, as the tanpura drone serves the purpose of providing the tonic root from which tension/resolution are implied), it does suggest that gauging the consonance/dissonance of NICM ragas is a function of both the relationships between the notes, or swaras , of a raga and the tonic drone, and the relationships between the swaras of a raga in the melodic, horizontal sense.
Tonal intervals form an important organizational principle of musical systems ( Castellano and Krumhansl, 1984 ). When assembled in different combinations, they form diatonic musical modes, the basis of melody construction in any musical system. Due to varying ecological settings, resources, and instrument constructions, some modes used by different musical systems are unique to their native culture ( Perlovsky, 2010 ). Most of our current understanding of the emotions associated with music—emotions presumed to be universal—has come from studies using the modes of Western classical music. Though the literature has consistently shown that listeners associate major and minor modes with positive and plaintive emotions, respectively ( Gagnon and Peretz, 2003 ), increasing work in the field of ethnomusicology suggests that different tonal systems may be able to elicit a subtler gradation of emotions ( Thompson and Balkwill, 2010 ).
North Indian Classical Music
The two dominant genres of Indian music are North Indian Hindustani classical music, and South Indian Carnatic classical music. Whilst the styles of singing, presentation of the notes, emphasis on structure of the musical modes and instruments used in each vary, Hindustani and Carnatic music share many common features, from the raga system, to the use of gamakas (similar to vibrato) and portamento (phrase-leading accents of rapidly increasing pitch; Capwell, 1986 ; Swift, 1990 ). That the arguments made below are made with respect to NICM is due to the fact that the Mathur et al. study from which the data were drawn focused on NICM ragas ; we suspect the same to hold true for Carnatic music as well.
The canon of standard NICM ragas is categorized and organized around a series of heptatonic scales known as thaats (Figure 1 ; Jairazbhoy, 1995 ). In the most widely accepted NICM system, there are 10 thaats consisting of different sequential combinations of 12 notes. Similar to Western Classical Music, the basic set of tones and tonal intervals used in NICM are the 12-tone octave divisions ( Castellano and Krumhansl, 1984 ; Bowling et al., 2012 ). While Western music is based on tones with defined frequencies (e.g., A = 440 Hz) NICM music is constructed from tonal intervals, known as swaras , which are defined in relation to a tonic tone (in practice this tonic takes the form of a drone note, described below). The “major” intervals (i.e., natural notes) are the shuddh swaras while the “minor” intervals are the komal swaras . The tonal intervals are Sa, Re, Ga, Ma, Pa, Dha , and Ni , either in their shush (major) or komal (minor) form, but never both within the same thaat ( Bhatkhande, 1934 ).
Figure 1 . Circle of Thaats . The circle of thaats illustrating inter- thaat distance. Nine of the ten thaats on the circle are members of Bhatkhande's classification system ( Bhatkhande, 1934 ). No. 7 thaat Bhairav is not currently used in NICM. Thaat Bhairav with the scale of S r G M P d N is not represented within the circle of thaats (Adapted from Jairazbhoy, 1995 , p. 59).
KEY CONCEPT 3 . Thaat The ten heptatonic scale families which are used to classify the canon of North Indian Classical ragas into tonally similar groups. Not all ragas in a given thaat include every note of that parent thaat , but all ragas in a thaat can be derived from its defining scale.
The fourth natural note, Ma shuddh , has a variant known as the tivr or the augmented fourth (raised by a semitone). Table 1 provides a reference to the shuddh (major) and komal (minor) intervals, and their Western equivalences, for readers versed in Western music theory.
Table 1 . Indian/western tonal interval equivalences and frequency ratios.
Across all thaats however, the tonic ( Sa ) and fifth ( Pa ) are considered immutable. Thus theoretically, there can be 32 different thaats , but Bhatkhande's early census and classification of traditional ragas found that the vast majority of ragas can be categorized into 10 families or “ thaats .” The prominent thaats have their names adopted from eminent ragas that are derived of the same mode though the ragas themselves need not necessarily be heptatonic.
It is believed that the most common modes were chosen by Bhatkande such that the structure and practicality were both preserved ( Chordia et al., 2008 ). These 10 canonical thaats , and the relationships between them, are summarized by the Circle of Thaats (Figure 1 , adapted from Jairazbhoy, p. 59). As seen in Figure 1 , since all thaats are heptatonic, as one moves along the circle starting from Bilawal (which has only major notes) in a clockwise manner, the number of minor intervals systematically increases till one reaches a thaat that has no name (but has the highest number of minor intervals). Thus Bilawal and the thaat with no name are diametrically opposite each other. Continuing further, as one move from Todi , the number of minor intervals decreases, and the number of major intervals increases systematically till one reaches Bilawal again.
Thaats provide a useful classification framework, but the core of NICM is the raga ( Bhatkhande, 1934 ; Vatsyayan, 1996 ) The word “ raga ,” which originated in Sanskrit, is defined as “the act of coloring or dyeing;” in this case, the mind and its emotions. The raga was thus conceived as a modal melody capable of eliciting specific emotions, or rasas .
An intrinsic difference between Indian classical and Western classical music is the tonic drone, usually played by a tanpura , provides a reference to the listener (a tonic Sa , often accompanied by a fifth Pa and/or octave Sa ') creating tonal relationships with the “solitary” melody line of the performance. Because the drone is sounded throughout the presentation of the raga , the entire piece can be viewed as a presentation of intervals, not just between notes of the melody line, but between each note and the Sa drone. Table 1 dictates the 12 swaras of Hindustani music displaying their Western classical counterparts, and the frequency ratio of the given note to the tonic.
Tonal Composition
Each raga uses a set of five or more notes from the seven comprising its parent thaat to construct a melody. Multiple ragas are generated from a single thaat , each distinguished by its own signature phrase ( pakar ) and a defined frequency of occurrence of particular notes, vadi being the most prominent note and samvadi being the second most prominent ( Jairazbhoy, 1995 ; Mathur et al., 2015 ). This feature allows two ragas to have the exact same note selection, yet sound different due to varying emphasis on the notes. Bhupali , belonging to thaat Kalyan , and Deskar to thaat Bilawal , are pentatonic ragas and use the notes that are common to both thaats ( Sadhana, 2011 ). Therefore, even while casually interchanged at times, it is important to understand that a raga is not synonymous with a scale; it is a modal melody comprising a defined note selection, differentiated not only on the basis of the notes contained, but also by the frequency of usage of certain notes, the sequencing of ascending ( aarohan ) and descending ( avrohan ) segments, and the pakar ( Kaufmann, 1965 ; Leifer, 1987 ; Jairazbhoy, 1995 ).
The specific combination of tonal intervals in a raga thus create a consonance-dissonance map that then determine which raga will feel pleasant on the ear, and which would fall into areas of dissonance, leading to a harsher sound and the need to be resolved into a consonant interval ( Helmholtz, 1875 ; Zuckerkandl, 1956 ). This subtle combination of tonal intervals permits subtle differences in emotions elicited through music to be investigated using NICM.
Rhythmic Structure
Ragas are usually presented in two consequent sections, the alaap and the gat . The alaap is an elaborate rendition of the various notes of a raga , rendered in free time, introducing and developing the melodic framework, defining characteristics, and mood of a raga . The gat follows the alaap , shifting emphasis to faster sequences of notes, with the accompanying tabla (the main NICM percussion instrument) providing a more explicit rhythmic structure while leaving behind most of the subtleties of pitch articulation. Importantly, the tonal structure of the raga is consistent between alaap and gat , only the tempo is changed. In this way, the raga structure offers an ideal experimental stimulus for disentangling the effects of tempo and tonality: tonality is controlled for between alaap and gat , while rhythm and tempo are manipulated. It is for this reason that NICM was used by Mathur et al. (2015) , enabling the group to isolate the effect of rhythm on emotional elicitationsand, in doing so, demonstrating the unique utility NICM offers as an experimental stimulus.
KEY CONCEPT 4. Alaap and Gat Raga performance has two stages, alaap and gat. The alaap introduces the raga, laying out a tonal framework. The gat introduces the rhythmic accompaniment, increasing in tempo and becoming stricter in rhythmic structure until there is very little room left for improvisation. As both stages use the same scale, changing tempo, ragas are experimental stimuli by nature, with which melodic and temporal effects on emotion can be distinguished.
Cultural Relationship between Raga, Rasa , and Bhava (Modal Melody, Mood, and Emotion Label)
On a more subjective level, emotional intent is a distinguishing feature of the NICM raga system. Whereas emotions and moods are implied characteristics of Western Classical music, Indian ragas have prescribed emotional effects, or rasa s ( Vatsyayan, 1996 ), each rasa intended to alter the mood ( bhava ) of the listener in a particular manner. Erotic love ( sringara ), patheticness ( karuna ), devotion ( bhakti ), comedy ( hasya ), horror ( bhayanaka ), repugnancy ( bibhatsa ), heroism ( vira ), fantastical, furious ( roudra ), and peaceful ( shanta ) were named in Bhatkhande's description of rasa and bhava ( Bhatkhande, 1934 ; Bowling et al., 2012 ).
Knowing the bhava that the rasa of a particular raga is meant to induce ( Mathur et al., 2015 ), such stimuli are invaluable to musical emotion studies, cross-cultural or otherwise, as the Circle of Thaats , and the canon of standard ragas it encompasses, can be utilized as a catalog for eliciting subtle gradations in emotional effect, some of which are culturally universal, others less so. Whilst Western listeners perceive the same basic emotions—happy, sad, angry, disgusted, surprised, fearful—as native listeners in Hindustani music, more subtle emotional gradations of basic emotions (e.g., “peacefulness” rather than happiness) are more easily identified by native listeners ( Balkwill and Thompson, 1999 ; William Forde Balkwill et al., 2004 ; Fritz et al., 2009 ; Laukka et al., 2013 ).
Mathur et al. (2015)
Recently, Mathur et al. (2015) tested the hypothesis that ragas elicit distinct emotional feelings. Using 3-min compositions of 12 ragas , presented in the form of an online survey, participants rated these ragas on the degree to which they elicited different emotions. All ragas were composed by a professional musician and rendered on sarod , an Indian stringed instrument.
As indicated earlier, Mathur et al. exploited the structure of a raga composition and presented each of the 12 ragas in both alaap and gat . Participants were instructed to rate each excerpt on eight distinct emotions on a 0–4 Likert scale (with 0 being “not at all felt” to 4 being “felt the most”) for each of the following emotion labels: happy, romantic, devotional, calm/soothed, angry, longing/yearning, tensed/restless, and sad. The study did not use a forced choice task but instead sought each raga to be rated for each of the eight emotions, sensitive to the fact that a single musical composition can elicit multiple moods. Specifically the study sought to determine if participant responses (1) differed between the emotions experienced by alaap and gat for various ragas (2) whether the psychophysical variables of rhythm and tonality influenced the emotions experienced.
The first finding of Mathur et al.'s study was that distinct ragas are associated with distinct emotional elicitations. This was similar to the findings reported by Balkwill and Thompson (1999) which showed that even western listeners who were unfamiliar with the tonal system of NICM perceived the intended emotion in ragas . However Balkwill and Thompson used ragas only in the alaap mode and implemented forced choice task. Participants in that study were required to indicate which of the four target emotions was dominant for the raga. Mathur et al. on the other hand asked each participant to rate the extent to which each of the emotions were experienced during the listening of the raga . Mathur et al. also found that that when the raga was presented in “ alaap ,” participants ratings were either calm (positive) or sad (negative) emotion. However, when presented in the gat condition, a finer discrimination of emotions were elicited (happy, romantic, calm) and (sad, longing, tension). This was the first experimental verification of the hypothesis that distinct emotions are associated with alaap and gat of a raga . Further, since Mathur et al. also used acoustic analysis to extract estimates of rhythmic regularity and tempo, they correlated acoustic features with behavioral ratings of emotional elicitation and were able to demonstrate that high arousal emotions like happy/tensed were associated with gat . As elaborated earlier the gat follows faster sequences of notes and provides an explicit rhythmic structure. A comparison of these results with those from the study conducted by Balkwill and Thompson showed that tempo and melodic complexity had some predictive power. However this was found only for some differences. Balkwill and Thompson (1999) used psychophysical ratings of tempo and melodic complexity and found that a combination of the two, predicted emotions primarily joy and sadness. Similar results were also reported by Gabrielsson and Juslin (1996) who showed that faster tempo were associated with positive emotions while slower tempo with negative emotions.
What was novel in Mathur et al.'s study was the finding that there is a change in the level of arousal between alaap and gat for the same raga. Since the tonal structure of the raga is preserved between alaap and gat , only the tempo is changed and the finding that high arousal emotions are associated with gat points to the fact that the raga structure is an optimal stimulus to dissociate the effects of tempo and tonality: tonality is controlled for between alaap and gat , while rhythm and tempo are manipulated. This result from Mathur et al. (2015) , illustrated that this unique structure of NICM that enables the isolation of the effect of rhythm on emotion elicitationrenders it as a useful experimental stimulus.
Of greater interest was the second primary finding of Mathur et al. (2015) study which showed that specific tonic intervals were robust predictors of elicited emotions. Major intervals were found to be associated with positive emotions and minor intervals to be associated with negative emotions. An analysis of tonal intervals of ragas , revealed that ragas rated as positive (such as “calm” and “happy”) had a greater mean frequency of occurrence of major intervals ( shuddh swaras ) whereas ragas with negative emotion (e.g., sad or tensed) were characterized by an increased frequency of minor intervals ( Komal swaras ). Figure 2 shows a distribution of mean frequency of occurrence of tonic intervals for the 12 ragas used in the study. Red bars represent the mean frequency of occurrence of shuddh swaras whereas that of komal swaras is represented with blue bars for each raga . To the best of our knowledge this finding for ragas is novel and has not been reported earlier.
Figure 2 . Tonality for ragas . The above figure represents the tonic interval distribution for the 12 ragas used in the study ( Mathur et al., 2015 ). The tonal distribution of ragas rated as “calm” is represented with red background color panel whereas the tonal distribution of ragas rated as “sad” is represented with blue background color panel. Within each panel the mean frequency of occurrence of shuddh swaras [S ( Sa ), R ( Re ), G ( Ga ), M ( Ma ), P ( Pa ), D ( Dha ), N ( Ni )] is depicted with red bars whereas the mean frequency of occurrence of komal swaras [r( re ), g( ga ), m( ma ), d( dha ), n( ni )] is depicted with blue bars.
To further explore the findings from Mathur et al. and assess the degree to which emotion ratings agree with rasa variation around the Circle of Thaats , we first associated a valence score with each raga , which is a difference in the ratings of the two highest experienced emotions, calm and sad. As a consequence, a value >0 is associated with positive valence whereas, a difference < 0 is associated with negative valence. Next, we define a tonal ratio, which is the ratio of the number of minor intervals (m) to major intervals (M) for each raga . The valence score and tonal ratios estimated are listed in Table 2 .
Table 2 . Ratios of minor (m) to major (M) intervals along with mean ratings for ragas belonging to each thaat as estimated in Mathur et al. (2015) .
In Figure 3 , we compare the tonal ratios with the valence score of the ragas used by Mathur et al. The tonal ratios and valence score as estimated for various ragas are represented along the Circle of Thaats (refer to Table 2 and Figure 3 ). The thaats for which emotional elicitations for more than one raga were available, an average valence score has been estimated (Table 2 ). The tonal ratios are expressed on a color scale (red to blue) while the average valence score associated with each thaat is indicated along with the name of the respective thaat . Figure 3 reveals that ragas belonging to thaat Bilawal (tonal ratio 0.00), elicits emotions with positive valence (e.g., valence score of raga Hansadhwani and Tilak Kamod are 1.22 and 1.28, respectively) where ragas belonging to thaat Todi (tonal ratio 0.57) and thaat Marwa (tonal ratio 0.29) evokes emotions of negative valence (e.g., valence score of Basant Mukhari or Mivan ki Todi is −0.35 and −0.33, respectively). Thus as the tonal ratio systematically increases moving clockwise from 0 and subsequently decreases, valence follows suit. In effect, the qualitative rasa variation adumbrated by the Circle of Thaats aligns with quantitative variations in both emotion rating valence and tonal ratio for the ragas tested.
KEY CONCEPT 5. TONAL RATIO The ratio of #minor/#Major intervals in a raga. As minor intervals are dissonant and Major intervals are consonant, this ratio gauges consonance/dissonance across an entire raga scale. Raga tonal ratios align with valences of participants' subjective ratings, suggesting the canon of North Indian ragas is a source for experimental stimuli with for those seeking a range and gradation of valences.
Figure 3 . Similarities between the tonal ratio (m/M) and valence of ragas when arranged along Circle of Thaats . The tonal ratio is color coded in increasing order on a scale of red to blue. Valence values associated with each thaat are indicated next to the names of the thaat , with negative valence preceded by the minus sign. For thaats where multiple ragas were included in Mathur et al. a mean valence was estimated based on the ratings in Table 2 .
Finally, a third finding of Mathur et al. (2015) was that out of the 12 tonic intervals, the minor second interval ( komal re ) was the best predictor of negative valence. As seen in Figure 3 , there are two locations along the circle of thaats , which we refer to as transition thaats where a change in tonal ratio is accompanied by a change in valence category (refer to Figure 3 and Table 2 ). These are Kafi to Asavari (positive to negative valence) and Purvi to Khamaaj (negative to positive). While symmetrically located on the circle of thaats , and similar tonal ratios the subsequent valence associated with the transition thaats is quite different. We attribute this to the specific minor intervals involved.
While the minor intervals present in transition thaats Kafi to Asavari are minor third ( komal ga ) and minor seventh ( komal ni ) those present in transition thaats Purvi to Marwa are minor second ( komal re ) and tritone ( tivra ma ) respectively. We suggest that the presence of the minor second in the transition thaats Purvi and Marwa leads to their association with higher negative valence score (−0.26 and −0.42, respectively) as compared to thaat Kafi (0.50). While the study by Mathur et al. did not include a raga from thaat Asvari the results encourage us to hypothesize that the minor second serves a crucial role in conveying negative valence. Further studies should attempt to investigate its role in detail by sampling a larger representation of ragas from each thaat .
The purpose of this review was to demonstrate NICM ragas as robust stimuli capable of eliciting distinct, predictable emotions, with tonal relationships and rhythmic tempo influencing the valence and strength of emotional effects in the listener. The ragas used in Mathur et al. (2015) were only 12 in number, but since they had been sampled across almost all thaats we attempted to speculate how the structure of the tonic intervals might predict the emotional valence associated with a raga .
Moving around the Circle of Thaats , emotional valence systematically varied along with the tonal ratios of each thaat . In this way, music emotion researchers may find experimental utility in the Circle of Thaats, as a catalog of stimuli varying in degrees of valence not only systematically, but incrementally , in the sense of finer gradations of valence than the more binary notions of “positive”/”negative” “happy”/”sad” typically ascribed to consonance and dissonance effects on emotion. In addition, built into the very structure of Indian compositions is an experimental manipulation of rhythmic tempo between alaap and gat , keeping tonal intervals constant, which in Mathur et al. (2015) revealed that the musical differences between sadness and tension, calmness and happiness may be more a function of rhythm than melody.
In sum, the catalog of systematically and incrementally varying emotional valence comprising the Circle of Thaats ; and a varying rhythmic structure which controls for tonality across a single raga , together make NICM music an invaluable auditory stimulus, tailor made and uniquely useful for experimentally controlled studies of musical emotion. We acknowledge that at present the preliminary results discussed here are speculative and require more detailed investigation. Since the tonic ratio is directly related to emotional response, further studies should also probe the nature of this relationship in influencing the strength of arousal of positive or negative valence of a raga , a feature that is often adopted by various performing artistes that has not been experimentally investigated. Future research would also do well to test the degree to which the constant tonic drone amplifies the strength of the emotional valences induced via the consonances and dissonances of these tonic ratios.
Finally, whilst a main aim of this review was to describe why ragas are a uniquely useful experimental stimuli for studies of music and emotion, this methodological prescription comes with an important caveat. Ragas are musical stimuli with deep, specific cultural origins and associations ( Wieczorkowska et al., 2010 ). But although they have been shown to elicit culturally-specific emotions which appear to be lost on non-native listeners, they also convey emotions that are shared between native and non-native listeners ( Laukka et al., 2013 ). Consequently, for experiments using raga stimuli for cross-cultural research this is crucial to note, as beyond universal emotions there are enculturated emotions elicited by culture-specific cues in music. For studies using only Western or only Indian samples, however, such cultural effects should not be a concern, as all participants would be equally advantaged or disadvantaged in identifying culturally dependent musical cues.
On a final, related point, it is important to note that the usage of ragas in the Western music cognition literature is nearly always in the context of cross-cultural differences. We hope Western readers come away from this review with an understanding that ragas can be thought of as more than “world music,” and useful for more than only cross-cultural studies of music cognition and emotion.
Ultimately, we hope this review brings the unique experimental value of NICM to the attention of music emotion researchers, useful for investigating emotional elicitations to music, within, between, and across different cultures.
Author Contributions
NS: designed the study and wrote the paper; JV and JA: contributed to paper writing; AM: collected data, conducted analysis, and contributed in writing the paper.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Acknowledgments
Funding for this work was provided by National Brain Research Centre, India. We thank Pt. Mukesh Sharma for composing the stimuli for the study. We thank our volunteers for their participation in the survey. We thank Hymavathy Balasubramanian for feedback during manuscript editing. We thank Hymavathy Balasubramanian for feedback during manuscript editing.
Author Biography
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Keywords: raga , emotion, tonic ratio, thaat , music
Citation: Valla JM, Alappatt JA, Mathur A and Singh NC (2017) Music and Emotion—A Case for North Indian Classical Music. Front. Psychol . 8:2115. doi: 10.3389/fpsyg.2017.02115
Received: 07 January 2017; Accepted: 20 November 2017; Published: 19 December 2017.
Reviewed by:
Copyright © 2017 Valla, Alappatt, Mathur and Singh. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) . The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
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A Comparative Study of Audio Source Separation Techniques on Indian Classical Music: Performance Evaluation and Analysis
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Music, a rich form of auditory expression, encompasses a diverse array of sounds, broadly classified into two main categories: Harmonics and Percussions. Harmonic sounds, distinguished by their distinct pitches, give rise to melodies and chords, while Percussive sounds, produced by instruments like drums and snares, introduce sudden pitch changes. Real-world music compositions often combine these two classes, creating challenges in processing and analysis. This research’s primary goal is to develop and compare effective algorithms for separating audio, into two distinct components, the isolating harmonic component and the percussive component. Exploiting the localization properties of these sound classes, with percussive sounds in time and harmonic sounds in frequency, it aims to achieve precise separation. This separation finds practical use in music remixing, key signature detection, instrument transcription, chord identification, and rhythmic analysis. The paper delves into theoretical foundations, implementation details, and comprehensive spectrogram analyses to demonstrate the approach’s effectiveness.
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Pandith, Y., Pavan, H., Abhishek, T.H., Ashwini, B. (2024). A Comparative Study of Audio Source Separation Techniques on Indian Classical Music: Performance Evaluation and Analysis. In: Senjyu, T., So–In, C., Joshi, A. (eds) Smart Trends in Computing and Communications. SmartCom 2024 2024. Lecture Notes in Networks and Systems, vol 946. Springer, Singapore. https://doi.org/10.1007/978-981-97-1323-3_10
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Impact of Listening to Indian Classical Music, or Rāgas, on the Electroencephalogram: A Meta-Analysis
Shrinit babel.
1 Morsani College of Medicine, University of South Florida, Florida, USA
Suman Baral
2 Surgery, Lumbini Medical College and Teaching Hospital, Tansen, NPL
Abhishek Srivastava
3 Center for Physical Medicine and Rehabilitation, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, IND
Ancient Indian classical music (ICM) has long been lauded and recognized for influencing emotional responses by influencing the human body's resonance. A meta-analysis of prospective case studies published in the last ten years on the effect of ancient Indian music rāgas on brain waves is investigated. This meta-analysis aimed to analyze published prospective studies investigating the effect of ancient Indian rāgas on EEG in healthy subjects.
The present study included prospective studies published since 2012. Studies were obtained by searching four databases, such as PsychINFO, PubMed, Google Scholar, and JSTOR, and searching related journals. Eligibility criteria included studies assessing the impact of listening to Indian classical music on the EEG. Primary outcomes were changes in the brain waves, frequency, and power and their relationship to activity-related arousal, attention, and mental tasks. The studies were analyzed according to the PRISMA guidelines.
There were a total of five included studies with 71 participants in the age range of 19-30, and the conditions for the test groups were generally similar except for varying types of rāgas used and time of day. Analysis of the data collected from 71 participants revealed that music interventions had statistically significant effects on increasing alpha activity and attention scores. Fractal analysis was sensitive enough to detect EEG brainwave changes while and after listening to the rāga musical intervention. Rāgas stimulate arousal in different areas of the brain, depending on the emotions they are designed to evoke. However, the synchronized studies together could not highlight a significant relationship between rāgas and EEG fractal dimension values.
Although the meta-analysis failed to reproduce the same results from the individual studies, potentially due to the small sample size and study variation, the meta-analysis opens doors to the potential of rāgas to elicit distinct emotions and serve as robust predictors of emotional response. Future studies can explore the therapeutic potential of various rāgas in the clinical setting, such as in the management of cognitive disorders and stress or in modulating heart rate variability and cognitive performance.
Introduction and background
The bloom and progress of human civilization have always been accompanied and intertwined with music. It is widely acknowledged that music can influence the human body's resonance and trigger a unique emotional response [ 1 ]. Particularly, various properties of a musical piece can either align or conflict with the body’s own rhythms, thereby conferring a distinct effect [ 2 ]. Regardless, the effect of music on the human body is multifarious. Studies have found that in the brain alone, music can help release the ‘happy’ neurotransmitters, modulate emotional states and mood, and reduce the perception of pain [ 3 , 4 ]. Listening to music helps keep the neurons and synapses more active, as different parts of the brain are involved in processing music [ 4 ].
These aspects have improved the acceptance of music-based interventions and music therapy across specialties. In recent years, the focus has moved to explore different types of mindful music and their applications in the clinical setting.
One such form of mindful music that is gaining interest is Indian classical music (ICM), colloquially known as rāgas [ 5 ]. It is one of the oldest systems of music in the world, but it is still practiced today. Literally, the prefix ra refers to the ‘tune of life’, so rāga means the coloring of life [ 5 ]. Rāgas are considered to be a fluid form of music, known for how each musical note has guidelines yet is improvisational at the same time [ 5 ]. This aspect makes the soundscape unique from other forms of music commonly employed in music therapy interventions.
Particularly, both ICM and Western music employ the same notes but differ in their styles (Figure (Figure4) 4 ) [ 5 ]. Rāgas place an emphasis on melody and rhythm and are thus monophonic in nature [ 5 ]. Meanwhile, western music joins many notes together to form chords, making it polyphonic [ 5 ]. Rāgas also have significant droning, or instantaneous acoustic oscillations, which are produced from instruments like the Tanpura or Surpeti. This aspect is collectively known as the Tanpura drone [ 5 ].
Under the ICM genre, there are many families and forms of rāgas, whereby unique rāgas have been ascribed to a certain time of day or season [ 6 ]. For example, Rāg Bhairav is encouraged to be played in the morning [ 6 ]. All of these elements of ICM are designed uniquely for each rāga to evoke a particular emotion and modulate arousal at particular times of the day [ 6 ].
Past neurological studies have also identified that music therapies can be evaluated with electroencephalogram (EEG) studies to explore their impact on the brain system [ 7 ]. Each frequency band of the EEG rhythm relates to specific functions of the brain. For example, the frontal midline theta rhythm (Fm theta) often appears on the EEG during consecutive mental tasks [ 8 ]. The features of ICM have encouraged studies to investigate the impact of listening rāgas on the EEG. A randomized control trial investigating Rāga Desi Todi in healthy college students found a significant increase in alpha band activity and a decrease in anxiety and depression scores [ 9 ].
As the acceptance of music-based interventions and music therapy improves across specialties, the focus has also moved towards exploring different forms of mindful music and discovering their appropriate applications in the clinical setting. Given its different musical approach, ICM continues to garner attention, necessitating a review to assess the impact of listening to this genre of music on the EEG.
The aim of this study was to analyze published prospective case studies in the form of a meta-analysis to assess the impact of listening to rāgas on the EEG of healthy individuals.
Materials and methods
The review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [ 10 ].
Search Strategy
The literature search was conducted using PsychINFO, PubMed, Google Scholar, and Web of Science electronic databases with criteria such as “EEG” AND “Indian Classical Music OR Rāgas” with dates from 2010 to January 2022. The search criteria were elaborated by employing the PICO tool to search for articles and determine their eligibility (Table (Table1 1 ).
PICO | Description | Search terms |
Population | Healthy individuals (i.e., no chronic illnesses or neurological/audiological conditions) | Healthy Patients |
Intervention | Indian classical music/Rāgas | Indian Classical Music OR Rāgas |
Comparison | No music (negative control) | |
Outcome | Primary outcome: changes in EEG and EEG fractal dimension analysis secondary outcome: moderating variables such as music preference | EEG or EEG fractal analysis |
Study Eligibility Criteria
The inclusion criteria for the obtained studies were publicly published prospective studies that assessed the impact of Indian classical music/rāgas on the EEG in English (Figure (Figure1). 1 ). Studies that were excluded were studies that did not include ICM/rāgas as an intervention, did not assess the impact of listening to music using the EEG, or were themselves review articles or other gray literature studies. The studies were manually evaluated for their eligibility among the investigators collectively.
Data Extraction and Synthesis
Review Manager 5.3 (The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen) was used to conduct the meta-analysis and organize the data, whereby an author independently performed the data extraction process after the studies were shortlisted. Study metadata such as the year of publication, sample size, gender, effect, and measures was extracted as an addition to the desired EEG-fractal dimension values for the meta-analysis. The EEG-fractal dimensions were evaluated for changes in brain waves, frequency, and power based on activity-related arousals. Study characteristics such as age group, listening time, type of rāga, and time of day were also tabulated to understand the degree of heterogeneity among the studies. Qualitative aspects of the results and additional measures of arousal (i.e., psychometrics) were also noted separately if they were employed in the study but not included in the meta-analysis.
Quality Assessment and Risk of Bias
The quality of the studies and their individual risk of biases were appraised using the Quality Assessment Tool for Quantitative Studies (QATQS) [ 11 ]. Two authors independently reviewed the selected studies using the QATQS tool and assigned a global rating to each study.
Eligible Studies
The quality of the studies and their individual risk of biases were appraised using the QATQS [ 11 ]. Two authors independently reviewed the selected studies using the QATQS tool and assigned a global rating to each study.
Across the individual studies, the sample sizes ranged from two to 30, with a total of 71 participants across all five studies. Male participants were dominant in the review, with an average of 59% males across all five studies. Among the five studies included, there were three major musical interventions: Tanpura drone, Hindustani rāga, and Carnatic rāga. One study included two positive control groups of subjects listening to hard rock and jazz. The time-of-day participants received musical intervention, and other relevant baseline characteristics are tabulated (Table (Table2). 2 ). Age distribution was measured differently across the studies (Table (Table2 2 ).
Study | Author | n | % Female | Age mean ± SD (min-max) | Intervention | Time of day | Global rating | EEG changes |
1 | Banerjee et al. [ ] | 21 | 20% | (20-25) | Tanpura Drone | Afternoon | Moderate | Significant changes in EEG-FD |
2 | Sanyal et al. [ ] | 2 | 0% | 30.0 | Hindustani Rāga | Afternoon | Weak | Increase in left frontal lobe arousal after Raga Chhayanat; increase in right frontal lobe arousal after Raga Darbari Kannada. |
3 | Maity et al. [ ] | 10 | 40% | (19-25) | Tanpura Drone | Afternoon | Weak | Increase in alpha and theta spectra width |
4 | Geethanjali et al. [ ] | 8 | 75% | 20.0±0.4 | Carnatic Rāga | Morning | Weak | Increase in beta power |
5 | Kumar et al. [ ] | 30 | 50% | 24.8±7.4/27.6±6.4 | Carnatic Rāga | Morning | Strong | Increased Alpha-wave frequency |
Results of Individual Studies
Banerjee et al. [ 9 ] assessed the change in brain state when subjected to audio. The investigation employed fractal dimensions, which is a sensitive parameter capable of distinguishing brain states even with an acoustic signal of simple musical structure. The study by Sanyal et al. [ 12 ] analyzed the effect of Hindustani music on brain activity during normal relaxing conditions using EEG. The finding showed that arousal-based activities were enhanced while listening to Hindustani music of contrasting emotions. Maity et al. [ 13 ] study the different levels of neural activation in the human alpha and theta brain rhythms under the effect of simple acoustical stimuli using different EEG feature classification techniques such as wavelet transform (WT) and multifractal detrended fluctuation analysis (MFDFA). It was found that in all the frontal electrodes, alpha as well as theta complexity increases, as is evident from the increase in multifractal spectral width.
Geethanjali et al. [ 14 ] also assessed the effect of music on brain function rate based on the experimenter’s choice of music (jazz, carnatic, and hard rock) with or without mental workload. The results of the study showed that jazz and carnatic music significantly improve brain function as compared to hard rock during mental tasks. Kumar et al. [ 15 ] assessed the effect of Indian classical music on brain activity using EEG. This study found that there is an effect of music on alpha waves.
Five studies report the effect of ancient Indian rāgas using EEG before and after using a random effect model [ 9 , 12 - 15 ].
The meta-analysis indicated that, contrary to the findings of individual studies, there is no statistically significant difference in fractal dimensions observed before and after EEG. Test for overall effect: Z = 0.28 (MD = −0.04, CI: −0.35 to 0.26 (p = 0.78>0.05) (Figure (Figure2). 2 ). The funnel plot (Figure (Figure3) 3 ) suggests that most of the studies chosen had sufficient statistical power for analysis considering the context of what is being investigated.
The individual studies were promising in demonstrating a relationship between the music intervention and EEG alpha activity along with attention scores. Fractal analysis was sensitive enough to detect EEG brainwave changes during and after listening to the rāga music intervention. However, the meta-analysis was inconclusive, unable to generate a statistically significant relationship between the music intervention and EEG brainwave changes. The discrepancy can be attributed to the fewer studies and varying study designs employed in each experiment. For example, the duration and time of day subjects received the rāga music intervention differed in every study. Preference or familiarity with a certain form of music could also be a factor in such EEG studies. From the studies, it was unclear whether the participants preferred rāgas or not.
Therefore, future studies can evaluate the impact of other variables, such as listening duration, participant preference, type of rāga, time of day, and specific physical and psychological participant covariates, to better delineate the potential of rāgas. Such variables, especially the time of day, can have significant effects. For example, music with an upbeat tempo can have different effects in the morning hours compared to the evening hours [ 16 ]. Participant preference is also a significant covariate and is often considered when developing guidelines for music-based interventions [ 17 ]. This can be coupled with randomized-controlled trials using particular rāgas lauded for their therapeutic properties as a music intervention in various contexts. The individual studies also did not mention the state of wakefulness among subjects or discuss in detail frontal rhythmic theta waves in adolescent subjects, both factors that are relevant to understanding the impact of the musical interventions.
One particular application of raga music therapy can be potential in comatose patients. The bioelectrical nature of the brain in comatose patients can be characterized by low amounts of high-frequency waves [ 18 ]. In fact, the EEG in comatose patients has prognostic significance: a more suppressed EEG is typically associated with a poorer prognosis, while the return of high-frequency waves may indicate higher chances for recovery [ 19 ].
As rāgas were found by some studies to increase the levels of alpha and beta waves [ 20 ], a study can evaluate the impact of listening to rāgas on the EEG of comatose or traumatic brain injury patients. Rāgas can also be evaluated in psychiatric patients, as one of the studies found that it increased attention scores among subjects, and another background study found a decrease in depression inventory scores. Likewise, music therapy has been previously found beneficial in schizophrenia patients, so a study can evaluate the benefits of listening to rāgas in such contexts [ 21 , 22 ].
Notably, while our meta-analysis specifically focused on the effects of rāgas, there are several similar studies analyzing brainwave changes upon listening to Nasyids (Nasheeds). Nasyids, akin to rāgas, place heavy emphasis on vocal expression but are not accompanied by musical instruments. Particularly interesting are two preliminary studies that paralleled the study by Geethanjali et al., comparing Nasyids to rock music [ 23 ] and Western classical music [ 24 ]. Both studies demonstrated a more pronounced increase in alpha band activity when listening to Nasyids as compared to rock music or Western classical music [ 23 , 24 ]. An additional study not only found comparable impacts on alpha band activity but also revealed that Nasyids have a mild moderating effect on diastolic blood pressure [ 25 ]. These findings can be coupled with our meta-analysis as another avenue of research. Future studies can explore advanced data science techniques, such as machine learning clustering, to identify the distinctive features of specific classes of mindful music and their correlation with brainwave changes [ 26 ]. This approach may provide a more nuanced understanding of the intricacies between sound characteristics and neurophysiological responses.
Rāgas employ unique pitch, time, and dynamics, along with their own spatial and temporal characteristics. This meta-analysis opens doors to the potential of rāgas to elicit distinct emotions and serve as robust predictors of emotional response. Future studies can explore the therapeutic potential of various rāgas in the clinical setting.
Conclusions
In conclusion, the meta-analysis was inconclusive and contradicted the results of the individual studies. The individual studies found that South Asian ragas increase alpha activity and improve attention scores. The likely discrepancy could be attributed to the limited number of investigations involving this topic as well as slight variations across the study designs that could not have been statistically classified. One aspect that must be acknowledged is that there is a limited availability of studies on this topic. Regardless, this systematic review and meta-analysis opens doors to further investigation in the area to better understand the therapeutic potential of integrating various genres of music in the clinical setting.
The authors have declared that no competing interests exist.
Author Contributions
Concept and design: Shrinit Babel, Suman Baral, Abhishek Srivastava
Acquisition, analysis, or interpretation of data: Shrinit Babel
Drafting of the manuscript: Shrinit Babel, Abhishek Srivastava
Critical review of the manuscript for important intellectual content: Shrinit Babel, Suman Baral, Abhishek Srivastava
Supervision: Suman Baral, Abhishek Srivastava
COMMENTS
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