XM has a hip-hop station concentrating on what's popular. Also a station concentrating on what's indie and up-and-coming. A station with nothing but rap from 1980-2000something. There's also a modern R&B station which has considerable crossover with the popular hip-hop station. And there's a 70s & 80s funk station which helps people discover the original songs that have been sampled to hell and back. As an added bonus, there's a Korean station which sometimes plays hip hop from there. I also sometimes hear French and Quebecois rap on one of the Canadian stations.

That's far more variety than what you'd get from a local radio station.

Youtube gives you almost every song ever made. Soundcloud gives you so many great unknown and indie artists. Bandcamp also gives you a huge & worldwide selection of independent rappers, and will help you discover them via their excellent blog.

And, for hip hop specifically, there's Datpiff and all the other sites hosting mixtapes.

I can understand being nostalgic for the stations of your youth, but it pales considerably compared to what's available now.