♪ don't have to live like a refugee ♪ ♪ all we hear is radio ga ga ♪ ♪ radio goo goo ♪ ♪ radio ga ga ♪ >> the great thing about live aid, it showed that musicians for me seemed to be the most altruistic people in the world. >> a group whose heart is in dublin, ireland. [ cheers and applause ] whose spirit it in the world. a group that's never had any problems saying how they feel. u2. >> when u2 play live aid, things had changed. rock and roll was getting serious. music could change the world. bono could change the world. ♪ sunday bloody sunday ♪ ♪ sunday bloody sunday ♪ >> u2, formed ten years ago when its members were still schoolboys is now arguably the hottest rock and roll band in the world. their last album "the joshua tree" has so far sold 13 million copies worldwide. >> u2 somehow in the video age