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There’s hardly a self-respecting aficionado of the American summer who doesn’t know the lyrics to “Summer Nights” — the ultimate ode to the season’s romance, from the Broadway smash Grease. The song achieved radio success before the film version even opened, but the cutie-pie vacation confessional became a full-fledged summer hit in 1978 when John Travolta and Olivia Newton-John crooned the lyrics in the Hollywood adaptation. Toes have been tapping ever since.