P2-08: Mid-level Harmonic Audio Features for Musical Style Classification
Almeida, Francisco C. F.*, Bernardes, Gilberto, Weiss, Christof
Subjects (starting with primary): MIR fundamentals and methodology -> music signal processing ; Musical features and properties -> musical style and genre ; Musical features and properties -> harmony, chords and tonality ; MIR tasks -> automatic classification ; Musical features and properties
Presented Virtually: 4-minute short-format presentation
The extraction of harmonic information from musical audio is fundamental for several music information retrieval tasks. In this paper, we propose novel harmonic audio features based on the perceptually-inspired tonal interval vector space, computed as the Fourier transform of chroma vectors. Our contribution includes mid-level features for musical dissonance, chromaticity, dyadicity, triadicity, diminished quality, diatonicity, and whole-toneness. Moreover, we quantify the perceptual relationship between short- and long-term harmonic structures, tonal dispersion, harmonic changes, and complexity. Beyond the computation on fixed-size windows, we propose a context-sensitive harmonic segmentation approach. We assess the robustness of the new harmonic features in style classification tasks regarding classical music periods and composers. Our results align with, slightly outperforming, existing features and suggest that other musical properties than those in state-of-the-art literature are partially captured. We discuss the features regarding their musical interpretation and compare the different feature groups regarding their effectiveness for discriminating classical music periods and composers.