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Tonality in Raag Music

Tonality in Raag Music. Parag Chordia, Alex Rae Georgia Institute of Technology. Objectives. Introduce a simple theoretical model of tonality for raag music Describe series of visualizations of raag space based on pitch-class distributions (PCD) Implications. Motivation.

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Tonality in Raag Music

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  1. Tonality in Raag Music Parag Chordia, Alex RaeGeorgia Institute of Technology

  2. Objectives • Introduce a simple theoretical model of tonality for raag music • Describe series of visualizations of raag space based on pitch-class distributions (PCD) • Implications

  3. Motivation • Why study tonality cross culturally? • Is their a common mechanism for the processing of hierarchical pitch structures?

  4. What is raag? Scale abstraction Ascending: C D G E F A G C Descending: C B A G F G D C Expression D G E F A G E F D C G F E F Set of motives E F D C D G E F A G G E G F E F

  5. A simple model of tonality Short-term memory window Pitch-detection Local PCD D(X,Y) Compare with stored schemas

  6. Visualizing Raag • Project PCD-based representation of raag onto low-dimensional space using SOM • How many tonal schemas are there? • Perceptual distance between raags

  7. Empirical Prototype Raag Map Hameer, Bihag, Khamaj, Yaman

  8. Empirical Segment-based Desh, Bihag, Khamaj, Yaman

  9. Sub-raag structure (Malkauns) Three distinct clusters

  10. Discussion • Visualizations suggest: • number of schemas less than number of nominal raags • sub-raag and super-raag (thaat) levels may be encoded (Castellano et al.) • Are representations of raag-schemas instance based or model based? Does this change with exposure? • Experimental work using reaction-time paradigm

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