Parker's Mood is a blues composition by Charlie Parker that originated as a spontaneous improvisation during a Savoy Records session on September 24, 1948, in New York City. Parker's three-chorus solo over the 12-bar blues was so inspired and thematically cohesive that it was later transcribed and registered as a formal composition through Mayhew Music Co. and Charlie Parker Music Co. in 1961. The melody draws from blues scales, stock blues figures, bebop runs, and arpeggios over substitute chords, progressing from a relatively simple introductory first chorus through a climactic middle development to a summarizing reprise in the third chorus. This structural arc reflects Parker's Kansas City blues roots and his idiomatic articulation and phrasing, making the piece both deeply accessible and harmonically sophisticated. Parker's Mood exemplifies how Parker's improvisations became de facto compositions, blurring the line between spontaneous creation and deliberate writing. The original recording features John Lewis on piano, Curly Russell on bass, and Max Roach on drums. Among the most significant subsequent recordings, Supersax recorded a 1972 arrangement by Buddy Clark for Capitol Records that treated Parker's solo as the melody, orchestrating it for five saxophones with Conte Candoli on trumpet. King Pleasure recorded an influential 1953 vocalese version, setting lyrics to Parker's melodic lines in a performance that became famous for its prophetic references to Parker's mortality. The tune endures as a revered blues standard in the bebop tradition.