Charlie Parker was one of the most consequential composers in jazz history, creating a body of work that defined the bebop vocabulary and remains central to jazz education and performance. Active primarily between 1940 and 1955, Parker composed over one hundred pieces, with his most concentrated output occurring in the mid-to-late 1940s during recording sessions for Savoy, Dial, and later Verve Records. His compositional method centered on the contrafact — writing original melodies over the chord progressions of existing standards — a technique he elevated from a practical convenience into a sophisticated art form. His rhythm changes compositions, including Anthropology, Moose the Mooche, and Dexterity, demonstrate remarkable variety over a shared harmonic foundation, while blues-based works like Billie's Bounce, Now's the Time, and Au Privave balance bebop complexity with the accessibility of the Kansas City blues tradition he grew up in. Among his most celebrated pieces, Ko-Ko reimagines the changes of Cherokee, Ornithology transforms How High the Moon, and Confirmation stands as a through-composed bebop melody of unusual harmonic sophistication. Parker frequently composed in real time during recording sessions, sometimes writing parts on the spot, blurring the line between composition and improvisation. His partnership with Dizzy Gillespie produced several co-composed bebop landmarks, and his tunes became the core repertoire through which successive generations learned the language of modern jazz. The Charlie Parker Omnibook, a collection of transcribed solos and melodies, has served as a foundational pedagogical text since its first publication, ensuring that his compositional legacy continues to shape jazz practice worldwide.