A never-released Bob Dylan tune will feature on the soundtrack of Justin Timberlake's new movie Inside Llewyn Davis. Dylan's forgotten recording of Farewell will appear on the album, produced by T Bone Burnett and writer/directors Joel and Ethan Coen, alongside tracks by Timberlake and Mumford & Sons frontman Marcus Mumford, whose wife Carey Mulligan stars in the film. Dylan recorded Farewell during sessions for his 1964 album The Times They Are A-Changin' but the track was never released.