U2 is successful because of their "mysterious" relationships. Guitarist The Edge believes the band - also consisting of frontman Bono, bassist Adam Clayton and drummer Larry Mullen Jr. - have survived almost 30 years in the music industry because they can anticipate each other's onstage antics like a rehearsed dance routine.
He said: "I'm acutely aware of what Adam, Larry and Bono are doing, whether or not we catch each other's eyes."