The session began at 7pm and ended at 1.30am the following morning. Prior to midnight work was confined to the control room of Studio Three, where two copies of the previous day's mix of I Want To Tell You were made.
The mixes of Tomorrow Never Knows were numbered 10-12. Number 11 was judged to be the best, and was earmarked for inclusion on Revolver. However, on 14 July 1966, the day the cutting for the album's manufacturing began, George Martin telephoned engineer Geoff Emerick to have it replaced with mix eight from 27 April.
With the mixes complete, attention turned once again to Eleanor Rigby. The Beatles had considered the song to have been finished on 29 April, but George Martin wanted one more addition. He asked Paul McCartney to sing "Ah, look at all the lonely people" as a counterpoint during the final verse. The overdub rendered the previous mono mixes redundant, so new ones were created on 22 June.