: 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
Rameau's "deep content" is centered on three revolutionary concepts that redefined how we understand music: Treatise on Harmony
The treatise is divided into four distinct books that move from abstract math to practical performance: : He established the "natural" relationship between chords,
: He was the first to formalize that a chord like is the same entity as Treatise on Harmony