Revolver (Beatles album) group collective since 1962, and gave them an unprecedented amount of time to prepare for a new album. Writing in "The Beatles Forever", Nicholas Schaffner cites 1966 as the start of the band's "'psychedelic' period" and adds: "That adjective implies not only the influence of certain mind-altering chemicals, but also the freewheeling spectrum of wide-ranging colors that their new music seemed to evoke." Music journalist Carol Clerk describes "Revolver" as having been "decisively informed by acid", following John Lennon and George Harrison's continued experimentation with the drug LSD since the spring of 1965.<ref name="Clerk/Uncut"> Available at Rock's Backpages (subscription required).</ref>
The Beatles (album) with Starr to reconsider. He duly returned on 5 September to find his drum kit decorated with flowers, a welcome-back gesture from Harrison. McCartney described the sessions for "The Beatles" as a turning point for the group, saying "there was a lot of friction during that album. We were just about to break up, and that was tense in itself", while Lennon later said "the break-up of the Beatles can be heard on that album". Of the album's 30 tracks, only 16 have all four band members performing. "The Beatles" contains a wide range of musical styles, which the authors