I removed the music on my Metallica and inserted Wu-Tang when I had it. It held up well. Theme wise they'd be awesome (old Kung Fu) music wise they're approachable for most, has good edited versions, and their music library is extensive. Licensing probably not an issue since they're down to earth dudes and love toys. They still make music.
Most other stuff is too hard, too gangsta, not large enough library, not up to date.