U2 is a band.
How to Dismantle an Atomic Bomb is the eleventh studio album by Irish rock band U2 . Songs of Innocence is the thirteenth studio album by Irish rock band U2 . `` Sunday Bloody Sunday '' is a song by Irish rock band U2 . The Joshua Tree is the fifth studio album by Irish rock band U2 . U2 . Popular for their live performances , the group have staged several ambitious and elaborate tours over their career .