1978: (FILE PHOTO) 'Grease' the musical, created by Jim Jacobs and Warren Casey, premiered on Broadway at the Broadhurst Theatre on June 7, 1972. By 1979 the musical had become the longest ever running show on Broadway, with the smash hit film starring John Travolta and Olivia Newton-John becoming the highest-grossing movie musical.

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Actors John Travolta and Olivia Newton-John embrace in a promotional still for the film, 'Grease,' directed by Randal Kleiser, 1978 in United States. (Photo by Paramount Pictures/Fotos International/Getty Images)