The problem with Naruto music isn't with the vocal stuff, most of that is great. It's the non-vocal stuff, most of which kind of sucks compared to other anime, where it's as good as if not better than the lyrical music. Then again, I think Naruto with some of the Eureka 7 or Code Geass vocal music would be pretty awesome. Two songs come to mind in particular: Flow - Colors from Code Geass and Days by the same band, from E7. Though Flow does do one of the Naruto intros.