The Bills have several theme songs associated with them. The most popular is a variation of the Isley Brothers hit "Shout", recorded by Scott Kemper, which served as the Bills' official promotional song from 1987 through 1990s. It was officially replaced circa 2000 with "The Power of the Bills", although "Shout" remains in usage today. It can be heard at every Bills home game following a field goal or touchdown and at the end of the game if the Bills win. The Bills' unofficial fight song, "Go Bills", was penned by Bills head coach Marv Levy in the mid-1990s on a friendly wager with his players that he will write the song if the team won a particular game.