playing on Rubber Soul a more precise tone than he had been able to achieve with his usual Höfner "violin bass". Inglis comments that, in its dialogue with Harrison's vocal lines, the "growling" fuzz bass contributes to the song's "persistent mood of menace", while Gould describes the effect as "the snarls of an enraged schnauzer, snapping and striking at its lead". Vocal overdubs Typical of the group's sound on the album, the song's arrangement includes three-part harmonies sung in homorhythm. Since the band also had to have their annual fan club Christmas disc completed at this time, their producer, George Martin, instructed the studio engineers to set up a second, ambient microphone and tape the Beatles as they rehearsed and recorded their vocal parts for the track. The tapes captured the three vocalists – Harrison, Lennon and McCartney – engaging in humorous banter and often unable to remember their parts. As a rare record of the group at work in the studio, the "Think for Yourself" rehearsal tape has invited comparison with the Beatles' Let It Be documentary film, made in January 1969. Whereas that film documents a period of acrimony among the band members, the 1965 tape shows them, in author Mark Hertsgaard's description, "clearly [taking] joy in one another's company". Once the vocals had been recorded successfully, and then double-tracked, Starr overdubbed tambourine and maracas. Contrary to Martin's hopes, nothing from the rehearsal tape was deemed suitable for the Beatles' 1965 Christmas record. In 1968, six seconds' worth of Harrison, Lennon and McCartney's a capella singing – repeating the line "And you've got time to rectify" – was used in the soundtrack of the Yellow Submarine animated film. McCartney subsequently incorporated other segments from the "Think for Yourself" rehearsal into his 2000 experimental album Liverpool Sound Collage. A fifteen-minute edit of the full tape became available unofficially in 1991 on the bootleg compilation Unsurpassed Masters, Volume 7. In 1995, a mix of the song featuring only vocals was among several tracks that were in the running for inclusion on the Anthology 2 compilation album but were ultimately passed over. Release and reception EMI's Parlophone label released Rubber Soul on 3 December 1965 in Britain, with "Think for Yourself" sequenced as the fifth track, between "Nowhere Man" and "The Word". The album was a commercial and critical success, although initially some reviewers in the UK were confused by the