The sound editing was supervised by bassist John Entwistle, and, with the exception of a 1965 performance of "Anyway, Anyhow, Anywhere" where Entwistle had to replace a missing bass track and the footage of Moon smashing a drum kit—as the original 8mm footage was silent, Moon overdubbed drum sounds—most of the sound was authentic. Entwistle did fight for—and won—getting him and Pete to overdub their backing vocals on the Woodstock footage, because Entwistle deemed the original gig's backup vocals "dire". During the process of sound editing, on 7 September 1978, Keith Moon died. All of the band members except Townshend had seen a rough cut of the film just a week before, and, after Moon's death, they were determined not to change anything.