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Sentiments are extracted from real performance through three steps: transcription, musical primitive analysis, and music understanding. In the transcription step, the acoustic signal is transformed into notes. Musical primitives such as chord progression, melody, rhythm, and tempo are analyzed from the notes using musical knowledge. Musical primitives are meaningful for the atmosphere of music. Sentiments are extracted by firing the heuristic rules representing the relation between musical primitives and sentiments for music understanding.>
Katayose et al. (Mon,) studied this question.