I personally am a lot more knowledgeable on hip hop, but i like that reggaejahm has the Caribbean hive vibe locked down, maybe some people wouldn't want to stray that far from its roots? You definitely have the branding potential down!

But, also the hip hop scene doesn't seem too terribly active on hive So it's not like it would dominate the community (here's a cool street art graffiti community i recommend) https://peakd.com/c/hive-198429/created

I would just really like to see again the way for musicians to upload mp3s to the chain, i think there is lots of potential here for music stuff