Mark Lewisohn’s The Complete Beatles Recording Sessions is a pretty reliable barometer of how important a particular session is in the scheme of things. He dispenses with today’s in 23 words:
A guitar overdub for the middle part of “Come Together” and vocal, piano, organ and percussion overdubs onto “Sun King”/“Mean Mr. Mustard.”
And that’s probably enough.
A propos of nothing in particular can we agree that “I know that she’s no peasant” is McCartney’s worst line?