harmonic rhythm

Harmonic rhythm refers to the rate at which chords change within a musical composition. If chords change frequently, it's considered a fast harmonic rhythm; if they change slowly, it's a slow harmonic rhythm. This pace significantly influences a piece's character and can be used by composers to create contrast and define different sections of the music.1

Harmony itself is the sound of two or more notes played simultaneously, forming chords. While melody and rhythm can exist independently, harmony is a vertical element in music that adds depth and personality when joined in succession. The interplay between consonance (stable sounds) and dissonance (unstable sounds) is fundamental to harmonic music, with dissonance creating movement and a demand for resolution. The treatment and acceptance of dissonance have evolved throughout music history.21