In 1969, John Lennon inserted a phrase from Chuck Berry in "Come Together", almost certainly as a tribute, but Berry's publisher was a Rottweiler and demanded recompense. If Lennon had used "Here Come Old Flattop" as his title, he might have been safe. For settlement, Lennon agreed to record some Chuck Berry songs on his album Rock'n'Roll, so it was no great hardship.
George Harrison had a worldwide hit with "My Sweet Lord" in 1971. It is odd that its producer, Phil Spector, never pointed out the similarity with "He's So Fine" by the New York girl group The Chiffons. After Allen Klein fell out with The Beatles, he bought the publishing rights to "He's So Fine" and sued Harrison in revenge. He won and over £1m changed hands. After the case, the judge remarked, "I actually like both songs", to which Harrison replied, "What do you mean 'both'? You've just ruled they're one and the same."