Things Must Pass and credits Tony Ashton as one of the keyboard players on both versions of "Isn't It a Pity". Ginger Baker, Clapton's former bandmate in Cream and Blind Faith, played drums on the jam track "I Remember Jeep". For contractual reasons, on UK pressings of All Things Must Pass, Clapton's participation on the first two discs remained unacknowledged for many years, although he was listed among the musicians appearing on the Apple Jam disc. A pre-Genesis Phil Collins played congas at a session for "Art of Dying". Harrison gave him a credit on the 30th anniversary reissue of the album, but Collins' playing does not appear on the track. Unsubstantiated claims exist regarding guest appearances by John Lennon, Maurice Gibb and Pink Floyd's Richard Wright. In addition, for some years after the album's release, rumours claimed that the Band backed Harrison on the country-influenced "Behind That Locked Door". Production Initial recording Music historian Richie Unterberger comments that, typical of the Beatles' solo work, the precise dates for the recording of All Things Must Pass are uncertain, a situation that contrasts with the "meticulous documentation" available for the band's studio activities. According to a contemporaneous report in Beatles Monthly, pre-production began on 20 May 1970, the same day as the Let It Be film's world premiere. Authors Chip Madinger and Mark Easter cite this as the probable date for Harrison's run-through of songs for Spector. John Leckie, who worked as an EMI tape operator in 1970, recalled that the sessions were preceded by a week of Harrison recording demos, accompanied by Starr and Voormann. The first formal recording session for the album took place at EMI Studios (now Abbey Road Studios) on 26 May, although Unterberger states that "much or all" of that day's recording was not used. The majority of the album's backing tracks were taped on 8-track at EMI between late May and the second week of June. The recording engineer was Phil McDonald, with Leckie as his tape operator. Spector recorded most of the backing tracks live, in some cases featuring multiple drummers and keyboard players, and as many as five rhythm guitarists. In Whitlock's description, the studio space was a "massive room... two sets of drums on risers, a piano, organ and other keyboards to the wall on the left, up against the far wall on the right were Badfinger, and in the centre were