Jazz Contrafact Detection

• URL: http://arxiv.org/abs/2208.00792v1
• Date: Mon, 1 Aug 2022 12:07:20 GMT
• Title: Jazz Contrafact Detection
• Authors: C. Bunks and T. Weyde
• Abstract summary: In jazz, a contrafact is a new melody composed over an existing, but often reharmonized chord progression. This paper develops a novel vector-space model to represent chord progressions, and uses it for contrafact detection.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In jazz, a contrafact is a new melody composed over an existing, but often reharmonized chord progression. Because reharmonization can introduce a wide range of variations, detecting contrafacts is a challenging task. This paper develops a novel vector-space model to represent chord progressions, and uses it for contrafact detection. The process applies principles from music theory to reduce the dimensionality of chord space, determine a common key signature representation, and compute a chordal co-occurrence matrix. The rows of the matrix form a basis for the vector space in which chord progressions are represented as piecewise linear functions, and harmonic similarity is evaluated by computing the membrane area, a novel distance metric. To illustrate our method's effectiveness, we apply it to the Impro-Visor corpus of 2,612 chord progressions, and present examples demonstrating its ability to account for reharmonizations and find contrafacts.

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