Renaissance - development of chord progressions in dance music. Passamezzo Antico: (Am G Am E, then Am G Am E Am)- Greensleeves. Passamezzo Moderno (C F G) - the primary triads still dominate music.
Dischord / dissonance - the tritone (Devil's Interval). (Jimi Hendrix "Purple Haze").
Summary - Harmonics generate triads, Notes fit chords, major and minor have diferent moods, the relationships between chords create a sense of progression.
Tonic and Dominant are the most important relationships in western music from 15c onwards. (Beethoven: "Ode to Joy", Bruce Springsteen: "Born to Run", Beethoven: "5th Symphony").