Um the Sony Cybershot H Series cameras are PHENOMENAL for photos and videos at concerts, they are pricey but they also have huge optical zoom even on video. I love it. You can see how good it is here...
http://www.youtube.com/user/jasmine84#g/u (the Hanson videos from Chicago)
I was on a balcony for that show and stayed there, so the ones right in on them are the 15x optical zoom. It's great My specific camera is the Sony Cybershot H50