John Lennon had wanted Day Tripper to be The Beatles' next single, but was overruled by the other band members, plus George Martin and Brian Epstein. As a compromise, the single was marketed as the first double a-side.
We Can Work It Out proved to be the more popular choice with the public, both through sales requests and radio airplay.
The Beatles' fastest-selling single since Can't Buy Me Love. It entered the charts on 9 December 1965, and seven days later reached number one - where it remained for five weeks. In all it spent 12 weeks on the UK singles charts.