On Harmony | Treatise

: Explores the physics of sound, focusing on string ratios, intervals, and the derivation of chords from a single "source" sound.

: Provides rules for creating music, including how to handle chord progressions and modulation. Treatise on Harmony

: He established the "natural" relationship between chords, particularly the movement between the tonic and the dominant , which remains the backbone of most Western music today. Structural Breakdown : Explores the physics of sound, focusing on