What is the significance of harmonic retrogression in music theory and how does it impact the overall composition of a piece?

Harmonic retrogression in Music Theory refers to the movement of chords or harmonies in a piece of music that move backward or regress rather than forward in a traditional sense. This can create tension, surprise, or a sense of resolution in the music. It impacts the overall composition by adding complexity and interest to the harmonic progression, creating a dynamic and engaging listening experience for the audience.