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>
Hey Jude (Beatles album) also true for cassette copies of the album, which retained the original title. Neither the front nor the back of the album jacket displayed the record's title (or the name of the band), but most copies were sold in a jacket whose spine read "Hey Jude". In an attempt to clear up any confusion caused by the preprinted labels, initial copies of the album displayed a sticker on the cover bearing the title "Hey Jude". The edition of the album with ""The Beatles Again"" label bore catalogue number SO-385 on the label but not on the jacket. This is because