The official soundtrack for Cowboy Bebop: Knockin' on Heaven's Door, released August 29, 2001. Composed by Yoko Kanno and performed by The Seatbelts, featuring Mai Yamane on vocals. The album expands the series' jazz-blues-rock fusion with full orchestral arrangements and Middle Eastern influences appropriate for the film's cinematic scope. Includes the iconic ending theme "Gotta Knock a Little Harder" alongside nineteen instrumental tracks spanning action, experimental, and atmospheric styles.