Do U2 follow a printed setlist, or do they allow for spontaneity?
Both. U2 have a printed setlist for each show, but will deviate from it if they desire. This tends to happen more at arena gigs, but it is not totally unheard-of at stadium shows. Sometimes Bono will call for a song not on the setlist, such as when Out Of Control was spontaneously played on 26 May 2005, or the band will briefly consult between songs onstage about an upcoming change. Other times, Bono will bring a fan onstage who has indicated that they can play a particular song, usually on guitar but sometimes on piano, and the band will play the song with the fan, such as the case of Who’s Gonna Ride Your Wild Horses on 9 December 2006.