text: rare coldplay/u2 duet? i stumbled across "what's going on" on limewire and i want to know if it's real, and any other information on it, because i think if coldplay and u2 would have recorded a song together, i would have heard more about it. they did another song together i think a while ago, i forgot which song it is, i know its u2's though, and bono also sang a snipet of yellow at his concert by coldplay, u can find it in the coldplaying forum heres a link