 During live performances of "I'll Go Crazy If I Don't Go Crazy Tonight", Mullen walks around the stage, contributing to the song with a large djembe strapped around his waist.Mullen is said to have a preternatural sense of rhythm.Brian Eno recounted that while working with Mullen on a U2 album, Mullen kept insisting that the click track was off and lagging behind the tracks that had already been recorded.