My son summed it up best when he walked in the room and said "Boy they sound terrible live". I really like listening to them on the radio, but they are horrible live. It's amazing what a recording studio can do for people. That being said, they know how to entertain and put on a show which is why they were out there. I thought Usher was mediocre at best as well. Slash... He at least sounded normal. She killed that song though, and not in a good way.