I don't know about most of them, but I can totally see KStew have the Jonas Brothers on there but labeled somebody else's name. Okay, I don't really think it is on there, but I would die if it was.
I myself and proud of what I have on my iPod. I mostly listen to Alternative but I have N Sync, Hilary Duff, Brit Brit. People look at me like I am crazy, but I'm always like, it's the music I grew up listening to, get over it. lol.
As for the other question, I would definitly go with Rob to a Coldplay concert. They are not my favorite band, but they are supposed to be absolutly amazinglive. I'm dying to see them.