Music for an Old Guy

I have been researching music for my 21 year old son who is in Iraq. He likes Rap, Rock or anything with a parental advisory or will irritate the old man. He will not have much luck with the old man been there done that. LOL If anyone know of some good music sites let me know. He will probably have his internet in a couple of weeks but it is not to reliable. I rather send it to him in a link or on a cd. Thanks