Composed by John Coltrane, "Moment's Notice" is a fast-swinging hard bop composition first recorded for his landmark 1957 Blue Note album Blue Train, with a sextet featuring Lee Morgan on trumpet, Curtis Fuller on trombone, Kenny Drew on piano, Paul Chambers on bass, and Philly Joe Jones on drums. The tune is built on an unconventional structure that departs from standard thirty-two-bar forms, using an ABAC layout with sections of eight, eight, eight, and fourteen bars, the final section extended by a six-bar dominant pedal point. Its harmonic language is dense and chromatic, featuring frequent modulations through non-diatonic key centers, backdoor ii-V progressions, and smooth voice leading where seventh chords resolve to thirds across bar lines. These characteristics make the composition both a rewarding vehicle for improvisation and a formidable technical challenge, requiring soloists to navigate rapid key changes at a brisk tempo. The piece represents an important bridge in Coltrane's development as a composer, foreshadowing the systematic harmonic exploration he would pursue more radically in "Giant Steps" two years later. While Blue Train was Coltrane's only date as a leader for Blue Note, it became one of the label's best-selling albums, and "Moment's Notice" emerged as one of its most frequently performed selections. The tune has entered the core jazz repertoire as a standard, regularly appearing in educational curricula and jam sessions. Saxophonist Emanuel Wilkins has offered a notable modern interpretation that explores freer, outside-the-changes approaches, contrasting with Coltrane's original inside playing.