Released: 6 August 1965 (UK), 13 August 1965 (US)
Co-written by Lennon and McCartney at the former's home in Weybridge, You're Going To Lose That Girl was recorded three days before The Beatles left England to film Help! in the Bahamas.
The Beatles performed the song in a sequence in Help!, filmed at Twickenham Studios where they would later make Let It Be. In the scene, The group mimes to the song in a recording studio environment, presumably intended to represent Abbey Road.
You're Going To Lose That Girl is notable for its key change, a rare occurrence in The Beatles' songs. During the bridge the song shifts from E major to G major.
The song's vocals are perhaps the most impressive of all on the Help! album, with John Lennon's double tracked lead lines creating call-and-response patterns with McCartney's and Harrison's backing vocals.
The lyrics, too, are quintessential early Lennon, warning an unidentified male of his predatory intentions towards his female lover.
In the studio
The Beatles began the song during the fifth recording session for Help!, on 19 February 1965. They recorded just two takes of the backing track, the first of which was a false start, with Lennon's rhythm guitar, Paul McCartney's bass guitar and Ringo Starr's drums recorded onto track one of the tape.
During the same session they added some overdubs. Track two contained electric piano by an unknown player, plus a lead guitar by Harrison – these were later wiped. Lennon, McCartney and George Harrison added vocals onto track three, and Lennon double-tracked his lead vocals onto the fourth.
You're Going To Lose That Girl was completed on 30 March 1965, when further overdubs were added. Harrison added a new lead guitar part onto track two, accompanied by bongos and piano, played by Starr and McCartney respectively. The song was mixed on 2 April 1965.