What is rhythm? I have not asked myself this question in a long time. Rhythm permeates my life as an ever-present flow of pulses, phrases, counting, and variation. Years of accumulated experience have furnished me with the sense that I know and understand it. Writing this chapter afforded me the opportunity to check in with composers who have deeply affected the way I think about rhythm. As I rummaged through their writings and works, I encountered a variety of perspectives that shook that sense of certainty and led me down multiple paths of inquiry.