Video: 'Six O'Clock'

(Wednesday, March 28, 1973) — For the first time since the 1970 break-up of The Beatles, Paul McCartney performed during a studio session for another Beatle, in this case, Ringo Starr, tonight at Apple Studios in London, contributing piano, synthesizer and backing vocals on his composition “Six O’Clock” for Starr’s upcoming album, Ringo.

Flutes and strings were later added to the song, with McCartney providing the arrangement.

Video: 'Six O'Clock (Extended Version)'

McCartney also overdubbed a “kazoo” vocal solo for Starr’s “You’re Sixteen” recording this evening. Starr tracked the song on March 5-6, 1973, in Los Angeles. It would top Billboard‘s Hot 100 singles chart in January 1974.

Video: 'Ringo Starr - You're Sixteen - 1973'

This also marks the first time all four Beatles have recorded on the same studio album since The Beatles’ Abbey Road in 1969. On March 13, 1973, John Lennon and George Harrison, performed on Starr’s recording of Lennon’s song “I’m The Greatest” in Los Angeles.

Harrison also contributed to three other tracks on Starr’s album, including “Photograph,” “Sunshine Life for Me (Sail Away Raymond),” and “You and Me (Babe).”