What role does harmony play in a composition?

Travis picking. Play. Rhythm guitar is a technique and role that performs a combination of two functions: to provide all or part of the rhythmic pulse in conjunction with singers or other instruments; and to provide all or part of the harmony, i.e. the chords, where a chord is a group of notes played together.

He developed the concept of linear perspective, and he had the ability to solve architectural problems using mathematics.