Ellington wrote the melody during intermissions at the in Chicago. The title was inspired by the personal credo of his former trumpeter, Bubber Miley , who was dying of tuberculosis at the time. Ellington described the phrase as the "expression of a sentiment which prevailed among jazz musicians" of that period. While Ellington composed the music, the lyrics were contributed by his manager and publisher, Irving Mills . Musical Significance
The original recording featured the distinctive vocals of , marking her first appearance with the Ellington Orchestra. Notable instrumental solos were performed by trombonist Joe "Tricky Sam" Nanton and alto saxophonist Johnny Hodges . Key musical elements that made it a hit include:
: Ellington defined swing as "that part of rhythm that causes a bouncing, buoyant, terpsichorean urge".