Collaboration
The song is performed by the Electric Light Orchestra and Olivia Newton-John. Newton-John sings the primary vocals, with ELO (Jeff Lynne) adding "parenthetic" vocals in the style of their other songs on the Xanadu soundtrack, along with providing the instrumentation.
A rare collaboration for ELO, the single reached no.1 in several countries and was the band's only UK number 1 single when it peaked there for two weeks in July 1980. The song peaked at number 8 on the Billboard Hot 100 in the US. This was the first song beginning with the letter 'X' to ever chart on the Billboard Hot 100 and it remained the only one until 2010's "X" by Xzibit.
Read more about this topic: Xanadu (Olivia Newton-John And Electric Light Orchestra Song)