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' Second Album Me to You", the single for which "Thank You Girl" was the B-side. The song was only released as a single from Vee Jay Records (re-issued by Capitol in 1965 as a "Star Line" single); it would not appear on an album in the US until the 1973 compilation "1962–1966" (also known as "The Red Album"). In Canada, this record could not be called the Beatles' second album, since "Beatlemania! With the Beatles" and "Twist and Shout" had preceded it. A slightly different track listing was released to the Canadian market with similar cover art under the title "The Beatles'