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Published in:
2021 | OriginalPaper | Chapter
Chord Function Identification with Modulation Detection Based on HMM
Authors : Yui Uehara, Eita Nakamura, Satoshi Tojo
Published in: Perception, Representations, Image, Sound, Music
Publisher: Springer International Publishing
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Abstract
This study aims at identifying the chord functions by statistical machine learning. Those functions found in the traditional harmony theory are not versatile for the various music styles, and we envisage that the statistical method would more faithfully reflect the music style we have targeted. In machine learning, we adopt hidden Markov models (HMMs); we evaluate the performance by perplexity and optimize the parameterization of HMM for each given number of hidden states. Thereafter, we apply the acquired parameters to the detection of modulation. We evaluate the plausibility of the partitioning by modulation by the likelihood value. As a result, the six-state model achieved the highest likelihood value both for the major keys and for the minor keys. We could observe finer-grained chord functions in the six-state models, and also found that they assigned different functional roles to the two tonalities.