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>
Revolver (Beatles album) following January, the Beatles carried out overdubs on live recordings taken from their 1965 US tour, for inclusion in the concert film "The Beatles at Shea Stadium". The group's manager, Brian Epstein, had intended that 1966 would then follow the pattern of the previous two years, in terms of the band making a feature film and an accompanying album, followed by concert tours during the summer months. After the Beatles vetoed the proposed film project, the time allocated for filming became a three-month period free of professional engagements. This was the longest period the band members had experienced outside the