Studio Two, EMI Studios, London
Recording for I'm Only Sleeping concluded on this day, with the addition of vocals by John Lennon, Paul McCartney and George Harrison.
The day began with the creation of two reduction mixes, the second of which was preferred, to combine the previous day's backwards guitar solos onto one track of the four-track tape.
Onto track four Lennon double-tracked his lead vocals in places (the main lead part had been added on April 29, 1966), while McCartney and Harrison simultaneously performed harmonies.
I'm Only Sleeping was mixed in mono on 12 May and 6 June, and in stereo on 20 May and 21 June.