John Lennon came to blows with a famous singer in 1980 after he accused them of "using" part of a Beatles song.
Lennon said Rod Stewart's song The Killing of Georgie employed the same melody as The Beatles hit Don't Let Me Down. The star told journalist David Sheff in 1980: "By the way, Rod Stewart turned that [Don't Let Me Down] into ‘[Georgie] don’t go-o-o.’ That’s one the publishers never noticed."
He jokingly asked: "Why didn’t he just sing Don’t Let Me Down? The same reason I don’t sing other people’s stuff: because you don’t get paid."