Harmonic Sophistication Across Genres

Key Insights

1. Jazz scores highest in harmonic sophistication (avg 0.82), driven by extended chords, frequent modulation, and chromatic voice leading.
2. Pop music shows the widest variance (0.12–0.78) — some pop is harmonically simple (I-V-vi-IV loops), while progressive pop rivals jazz in complexity.
3. EDM and electronic genres score lowest on average (0.18), but sub-genres like progressive house and trance show significantly higher scores (0.45+).
4. Progressive rock occupies a unique middle ground (avg 0.65) — using complex harmony but with rock's rhythmic directness, creating a distinctive "sophisticated power" aesthetic.

Methodology

Harmonic sophistication is computed using Tymoczko's geometric model, measuring total distance traveled through pitch-class chord space. Additional factors include chord vocabulary size, frequency of non-diatonic chords, voice leading smoothness, and presence of secondary dominants. Scores are normalized 0-1 within the analyzed corpus.