U2's the best rock group in the world of their music type, period. There's Led Zep in phychadelic rock, ColdPlay in alternative, and U2 in "heroic" rock (as their fans call it).
Formed in the late 70s, U2 have slowly but steadily risen to the very top of rock fame. Starting early with classics like "I Will Follow" and "New Year's Day", they have skyrocketed to global success and stardom. Although, many believe their "U2 Pop" album to be their biggest - only - flop. U2 just isn't cut out for pop, and they realized it soon enough. Thank God.
Other than their wonderful passion for their songs and music, they also - Bono in particular - have a large interest in humanitarian rights. Bono strives to eliminate third world debt and extreme poverty. U2 were also some of the most noticable groups in events like Live Aid (80s) and '05s Live 8. They reportedly stole the show in Live Aid, actually.
Paul David Hewson (Bono) - Lead vocals, rythm guitar, harmonica, stage beast
David Evans (The Edge) - Lead guitar, keyboards & piano, backing vocals, data master
Adam Clayton - Bass, posh incarnate
Larry Mullan Jr. - Drums & percussions, (rarely) backing vocals, humble rebel
'U2 sucks, man. They don't know shit about music.' - Jerk
'U2 doesn't suck, you do. Apparently, they know a little more than you do about music, my dumbass rap-and-punk loving friend.' - Me