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Automatic Tonic Identification in Indian Art Music: Approaches and Evaluation

Title Automatic Tonic Identification in Indian Art Music: Approaches and Evaluation
Publication Type Journal Article
Year of Publication 2014
Authors Gulati, S. , Bellur A. , Salamon J. , Ranjani H. G. , Ishwar V. , Murthy H. , & Serra X.
Journal Title Journal of New Music Research
Volume 43
Issue 1
Pages 53-71
Abstract The tonic is a fundamental concept in Indian art music. It is the base pitch, which an artist chooses in order to construct the melodies during a rāg(a) rendition, and all accompanying instruments are tuned using the tonic pitch. Consequently, tonic identification is a fundamental task for most computational analyses of Indian art music, such as intonation analysis, melodic motif analysis and rāg recognition. In this paper we review existing approaches for tonic identification in Indian art music and evaluate them on six diverse datasets for a thorough comparison and analysis. We study the performance of each method in different contexts such as the presence/absence of additional metadata, the quality of audio data, the duration of audio data, music tradition (Hindustani/Carnatic) and the gender of the singer (male/female). We show that the approaches that combine multi-pitch analysis with machine learning provide the best performance in most cases (90% identification accuracy on an average), and are robust across the aforementioned contexts compared to the approaches based on expert knowledge. In addition, we also show that the performance of the later can be improved when additional metadata is available to further constrain the problem. Finally, we present a detailed error analysis of each method, providing further insights into the advantages and limitations of the methods.
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