This one had more than just a few bars of music "borrowed" :
"Be a Clown" is a song written by Cole Porter for the 1948 film The Pirate. The song was first performed by Judy Garland and Gene Kelly in the film The Pirate.
The song was featured in an episode of Land of the Giants and also in the 2004 film De-Lovely.
The song "Make 'Em Laugh" (by Nacio Herb Brown and Arthur Freed) in the film Singin' in the Rain was largely plagiarized from "Be a Clown"[1] although Cole Porter did not make a complaint. Both films were MGM productions.
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