The word Xanadu showed up in the poem Kubla Khan by Samuel Taylor Coleridge (1772-1834). Xanadu is the fictional name of the land where Khubla Khan ordered the dome to be built. The word came to mean a paradise. In the movie Citizen Kane, Xanadu was the name of Charles Foster Kane’s house.
The song was written for the movie musical of the same name). Newton-John starred in the film with Gene Kelly. The soundtrack, which contained all songs by Newton-John and The Electric Light Orchestra, was a hit. The first single, Magic, went to #1 in America.
In the trailer for the film, Olivia-Newton John is billed as “the girl you loved in Grease.” This song plays over the end of the trailer.