"Xanadu" is the title song from the soundtrack of the 1980 film Xanadu. Written by Jeff Lynne of the English rock band Electric Light Orchestra (ELO), the song is performed by English-born Australian singer, songwriter and actress Olivia Newton-John, with Lynne adding parenthetic vocals in the style of his other songs on the Xanadu soundtrack, and ELO providing the instrumentation. It was Lynne's least favourite of his own songs. "Xanadu" reached number one in several countries and was the band's only UK number-one single, when it peaked there for two weeks in July 1980. It was certified Silver by the British Phonographic Industry. It also peaked at number eight on the US Billboard Hot 100.