Description of Chord Progressions by Minimal Transport Graphs Using the System & Contrast Model

Corentin Louboutin (1) , Frédéric Bimbot (1)

1 PANAMA - Parcimonie et Nouveaux Algorithmes pour le Signal et la Modélisation Audio

In this paper we model relations between chords by minimal transport and we investigate different types of dependencies within chord sequences. For this purpose we use the “System & Contrast” (S&C) model, designed for the description of music segments at the phrase scale, to infer non-sequential structures called chord progression graphs (CPG). Minimal transport is defined as the shortest displacement of notes, in semitones, between a pair of chords. The paper present three algorithms to find CPGs for chords sequences: one is sequential, and two others are based on the S&C model. The three methods are compared using the perplexity as an efficiency measure. The experiments on a corpus of 45 segments taken from songs of multiple genres, indicate that optimization processes based on the S&C model outperform the sequential model with a decrease in perplexity over 1.0.

Mots clés: chord progression; system & contrast; minimal transport; music processing

Domaines: Traitement du signal et de l'image [eess.SP]; Musique, musicologie et arts de la scène

Corentin Louboutin, Frédéric Bimbot. Description of Chord Progressions by Minimal Transport Graphs Using the System & Contrast Model. ICMC 2016 - 42nd International Computer Music Conference, Sep 2016, Utrecht, Netherlands. ⟨hal-01421023⟩