I know that my wife was involved in the music community called Hive Open Mic, which still exists... As we at @ourpick support the best posts from there... Check it out at: https://peakd.com/c/hive-105786/created
But, our Hive musicians indeed need more exposure as they deserve it! If you want, maybe you can contact @jesuslnrs about the idea that you have (he is an admin of that community)... He would gladly contribute if he can!
Cheers!
Everyone can definitely get involved and promotion basically starts on Twitter for any musician. Thats the purpose of this. Getting those on Twitter to come to hive, enjoy their time, and promote Hive to their audiences of hundreds of thousands.