While The Beatles were together and releasing albums, there were occasions when band members wouldn’t play on a certain track. One famous example came on Paul McCartney’s masterpiece “Yesterday.” For that song, the arrangement didn’t need any other Beatles.
In later years, you would usually find band members missing on tracks due to some issue or other. On “Back in the U.S.S.R.,” Paul played drums because Ringo had walked out on the group during the White Album sessions.
The following year, while recording of Abbey Road, John Lennon didn’t participate on “Maxwell’s Silver Hammer” because he hated Paul’s song. (John had also declined to play on George Harrison’s “I Me Mine.”)
But there was one common denominator on every example: Paul was fully invested in the recordings. Looking back, Paul remembered skipping a session only once. It happened late in the recording of Revolver.