On 4 January 1967 The Beatles had added piano and guitar parts to track two of the Penny Lane four-track tape. During this session those overdubs were wiped, and replaced with rhythm guitar, bass guitar, drums and congas, the latter played by John Lennon.
With all four tracks of the tape, a reduction mix was made, numbered take eight, in which all the recordings so far were mixed down to just two tracks. Onto this Lennon and George Martin added piano, Lennon, Paul McCartney and George Harrison sang backing vocals, and handclaps were also added.
These recordings were never used, however, and another reduction mix, take nine, was made to replace the previous one. The session finished at 1am on the morning of 7 January, and work continued on Penny Lane two days later.