The song was recorded on 18 October 1965, and was complete except for the instrumental bridge. At that time, Lennon had not decided what instrument to use, but he subsequently asked George Martin to play a piano solo, suggesting "something Baroque-sounding". Martin wrote a Bach-influenced piece that he found he could not play at the song's tempo. On 22 October, the solo was recorded with the tape running at half speed, so when played back at normal pace the piano was twice as fast and an octave higher, solving the performance challenge and also giving the solo a unique timbre, reminiscent of a harpsichord.