If you go to the main site
http://liveearth.msn.com and click "watch the show" you can select which concert you want to view and then select which song you want to watch. I'm quite impressed at them setting up such a good system. I finally got to see Sakamoto and chums (Yellow Magic Orchestra)
@daigong - The Police were great but having Kanye West join in on Message In A Bottle was quite awful. He just walked around saying "yeah, yeah, yeah", "put your hands in the air!", yadda yadda yadda. He didn't know any of the lyrics