"U.F.O." is a song by British alternative rock band Coldplay and the ninth track from their fifth studio Mylo Xyloto. The song was first mentioned upon unveiling the track listing for Mylo Xyloto on 9 September 2011 after the album was officially completed. It was released along with the album on 24 October and later released as a B-side to "Up with the Birds".
The song bases itself around the 4-chord "Mylo Xyloto" melody, the main guitar riff reprising the 4-note structure. The song itself was written in the same time as "Charlie Brown", being one of the earliest songs recorded for the album. Both the song "Mylo Xyloto" and "A Hopeful Transmission" would be written afterwards, having shared the same melody with each other. There have been 3 different recorded versions of the song, all recorded throughout 2009 and 2010.
"Harking back to the title track of their debut album, U.F.O is a melancholic interlude, Chris Martin's acoustic plucks joined by the swirl of strings halfway through, resembling a more saccharine take on Radiohead's Faust Arp. The escapism-themed lyrics ("let's fly/ split the sky...") explain the title, just in case you were wondering if Chris Martin was about to grow a beard and start picketing outside Area 51 with Robbie Williams."