The term 'Travolta Musical' refers to the 1978 musical film GREASE, starring John Travolta and Olivia Newton-John. The movie was a huge success, becoming the highest-grossing musical of all time and spawning a sequel and a Broadway adaptation. It follows the story of two high schoolers, Danny and Sandy, as they navigate teenage life in the 1950s. The movie features classic songs such as 'Summer Nights, ' 'Greased Lightnin', ' and 'YOU're the One That I Want.'