Welcome to HIVE / back. Well, am not sure about what communities you'll like. There is this MUSIC community, but I see most of the music being posted in the GEMS community. Interaction can be a bit low to be honest, depends on the user. Many just vote, some comment or go into real conversations. 3SPEAK is available for music uploads (video based) and solely running with the HIVE chain. I would take a bit of time to go through the top communities. I suggest to use PeakD, that user interface, this UI lists the top communities at the top and is possible to search on keywords for communities.