See that's a great way to alienate your fan base. You end up gearing towards that sound and creating a weird mish mash. Sure you'll get an anomaly here and there but for the most part rappers doing this have made terrible albums.
Nah I don't think so. Hip-Hop as a whole is constantly taking from other genre's and putting/blending it together in new ways. I don't see why studying other music would be any different. Now nikkas don't need to going off trying to make the rap Dark Side of the Moon
