Though "Summer Nights" comes straight from the musical “Grease,” John Travolta and Olivia Newton-John gave the tune a life of its own in their performance for the 1978 film. Detailing the summer romance of characters Danny and Sandy in a fun, faux-‘50s style duet, the song made it all the way to No. 5 on the Billboard Hot 100 for the U.S. and spent seven weeks at No. 1 in the U.K.

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