What artists/bands might a 10 year old boy like?

I am getting my 10 year old son an iPod for Christmas. I wanted to download a few songs/albums for him before I give it to him. Up until now I have bought him mainly the Kids Bop stuff. But, he hangs out with boys that are a year or two older than him, and I know he'd like some "more age appropriate/big kid" music. I'm just not sure where to start. I don't want him listrning to any music with cursing or degrading remarks or anything like that. Some good Christian rock would be good, too. He likes the song "The Boys of Fall" by Kenny Chesney...others similar to that would be nice. I teach 3rd grade and know that my girls like Justin Bieber, but the boys don't seem to. Any suggestions on songs/artists/albums would be greatly appreciated. Thank you!