Studio Two, EMI Studios, Abbey Road
Producer: George Martin
Engineer: Malcolm Addey
The Beatles' recording sessions were largely focused on particular songs. On this occasion, however, they spent around seven hours, between 11pm and 6.15am, jamming instrumentals which were never released.
Just 16 minutes of the session was recorded, with detuned electric guitars - one of which had a vibrato effect - plus harmonium and drums. The Beatles recorded another of these jam sessions on 1 June 1967, the day Sgt Pepper's Lonely Hearts Club Band was released.