"5.15" (sometimes written "5:15" or "5'15") is a song written by Pete Townshend of British rock band The Who from their second rock opera, Quadrophenia (1973). The song reached number 20 on the UK Singles Chart, while the 1979 re-release (accompanying the film and soundtrack album) reached number 45 on the Billboard Hot 100. Although written as "5.15" on the single cover, on the back cover of Quadrophenia (the album from which the song is taken) it is written as "5:15".