I've been loving RFF the last few months, it might be my favorite new thing I've found since I switched from Twitter to Mastodon. It also always shows you the artists' fediverse usernames so you can follow them, and they usually have a Bandcamp link if you want to buy an album.
They recently said that they could use some volunteer help. I haven't been able to check out what they need yet, but their matrix channel is #radioFreeFedi:matrix.org, I think that's where they organize things.