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 group 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.
The group's performance is curtailed when the gang chasing Ringo cuts a hole around his drum kit from the room below.
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 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 completed the song during the fifth recording session for Help!, on 19 February 1965. They began by recording just two takes of the backing track, the first of which was a false start.
After the rhythm track was completed a series of overdubs were added. These included lead and backing vocals, Paul McCartney's Steinway grand piano part, Ringo Starr's bongos, and George Harrison's Fender Stratocaster guitar solo.