the management contract with Klein, but he was out-voted by the other Beatles. Martin stated that he was surprised when McCartney asked him to produce another album, as the Get Back sessions had been "a miserable experience" and he had "thought it was the end of the road for all of us". The primary recording sessions for Abbey Road began on 2 July. Lennon, who rejected Martin's proposed format of a "continuously moving piece of music", wanted his and McCartney's songs to occupy separate sides of the album. The eventual format, with individually composed songs on the first side and the second consisting largely of a medley, was McCartney's suggested compromise. Emerick noted that the replacement of the studio's valve mixing console with a transistorised one yielded a less punchy sound, leaving the group frustrated at the thinner tone and lack of impact and contributing to its "kinder, gentler" feel relative to their previous albums. On 4 July, the first solo single by a Beatle was released: Lennon's "Give Peace a Chance", credited to the Plastic Ono Band. The completion and mixing of "I Want You (She's So Heavy)" on 20 August was the last occasion on which all four Beatles were together in the same studio. On 8 September, while Starr was in hospital, the other band members met to discuss recording a new album. They considered a different approach to songwriting by ending the Lennon–McCartney pretence and having four compositions apiece from Lennon, McCartney and Harrison, with two from Starr and a lead single around Christmas. On 20 September, Lennon announced his departure to the rest of the group but agreed to withhold a public announcement to avoid undermining sales of the forthcoming album. Released on 26 September, Abbey Road sold four million copies within three months and topped the UK charts for a total of seventeen weeks. Its second track, the ballad "Something", was issued as a single – the only Harrison composition that appeared as a Beatles A-side. Abbey Road received mixed reviews, although the medley met with general acclaim. Unterberger considers it "a fitting swan song for the group", containing "some of the greatest harmonies to be heard on any rock record". Musicologist and author Ian MacDonald calls the album "erratic and often hollow", despite the "semblance of unity and coherence" offered by the medley. Martin singled it out as his favourite Beatles album; Lennon