: 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
. Before this, theorists viewed these as entirely different intervals above a bass note. Treatise on Harmony
: Focuses on the practical art of playing from a figured bass on instruments like the harpsichord or organ. Availability and Modern Use Treatise on Harmony (Dover Books On Music: Analysis) : He established the "natural" relationship between chords,