The Beatles continued work on Penny Lane on this day. This was the second session for the song, and took place from 7pm to 3am.
The new mix was instigated by Paul McCartney, who wanted the song faster than the original recording speed. The new mix raised the key from C to C sharp, although the stereo mix created on 17 April 1967 was slightly faster still.
The first task needed for Penny Lane was the creation of a reduction mix to free up space on the four-track tape. This new mix was named take seven. Onto track four McCartney overdubbed lead vocals, with John Lennon providing backing. These were recorded with the tape running at 47.5 cycles per second rather than the normal 50, so they sounded faster upon playback.
By this time it was the early hours of 31 December, so further planned overdubs for Penny Lane were postponed until the new year. Two mono mixes were created, however, to enable acetate reference discs to be cut.