for most of the sessions were substandard. He was unable to play in 6/8 time on the track "Music Must Change", so the drums were removed completely from the track, and replaced with the sound of footsteps and a few cymbal crashes. Bassist John Entwistle remarked that Moon "couldn't think of anything to play." On another occasion, Astley recalled, "I was doing a drum track, and he hadn't learned the song. I actually had to stand up and conduct. He said, 'Can you give me a cue when you get to the middle part?' [...] He hadn't done his homework." Entwistle similarly described Moon as "really out of condition", and "disgusted with himself" as a result. The recording was further delayed when lead singer Roger Daltrey underwent throat surgery, and when during a lengthy Christmas break, Townshend sliced his hand in a window during an argument with his parents. Former Zombies and Argent member Rod Argent was also called in to replace session keyboardist John "Rabbit" Bundrick after Bundrick suffered a broken arm falling out of a taxi at the studio door. When the sessions resumed in March, they were moved to RAK Studios, which caused further delays due to the equipment malfunctioning, including the wiping of a backing track. Astley stated that the RAK equipment made the existing material sound different when played back, necessitating further delays as he attempted to fix the audio problems. In one incident, Daltrey punched Johns in the face due to an argument over a rough mix, rendering him unconscious. The argument was fueled by Ted Astley adding a string arrangement to "Had Enough", which Daltrey derided as "slushy". After one long and frustrating day, Townshend planned to fire Moon from the band unless he cleaned up his act. The plan drove Moon to attempt to kick his alcohol habit and work more enthusiastically. Due to a prior commitment to produce the Joan Armatrading album To the Limit, Johns had to leave in April, with Astley remaining as sole producer. Under Astley's command, the sessions returned to Ramport, with all of the drums except for "Who Are You" recorded in the last two weeks of production. Who Are You was released on 18 August 1978. Moon died on 7 September 1978, just under a month after the album's release; on the cover, he is shown sitting in a chair labelled "Not to be taken