U2 is a rock band.
How to Dismantle an Atomic Bomb is the eleventh studio album by Irish rock band U2 . Pop is the ninth studio album by Irish rock band U2 . Songs of Innocence is the thirteenth studio album by Irish rock band U2 . U2 . This experimentation continued through their ninth album , Pop ( 1997 ) , and the PopMart Tour , which were mixed successes .