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>
Greatest Hits Volume 1 (Beatles album) Australia in June 1966. The stereo version followed twenty months later . In 1973, both volumes of the album were repackaged as a double album by EMI Australia to commemorate the 10th anniversary of the Beatles first single in Australia. The release was titled "The Beatles Australian 10th Anniversary 1963-1973 Souvenir Presentation - The Beatels' Greatest Hits Volumes 1 and 2". Eight different Australian radio stations promoted the album by featuring their logo on eight different stickers. The album was only available for a few months before it was quietly deleted. By mid-1973, both volumes of the compilation had sold