not sure if this post is in scope with this section (maybe it belongs more to "General Music Discussion"?), but just yesterday I was made aware of a project called radio free fedi, which in their own words is a "small web, consent driven, artist populated, non-commercial mechanism, attribution promoting, community radio for the fediverse". The website provides many more details on what they wanted to achieve with this radio project, which I encourage you to check out. Different artists (me included) contributed songs to the radio, which runs 24/7 rotating the music they have available. I've been listening to it in the background for the last couple of days, and I have to say I've listened to a bunch of really cool songs from artists I would never have been aware of otherwise: there's different genres that alternate in the rotation, which can be a bit confusing at first, but apparently one of the planned future enhancements is indeed creating some themed/genred subset.
I think it's mostly meant to give more visibility to musicians with a Mastodon presence, but I'm not sure if a Mastodon account is indeed required (advertising your Mastodon identity is optional). At the same time, the use of FOSS for writing music is probably not required at all either, since while I did make an extensive use of it (I wouldn't be here otherwise!), many others in that list probably didn't; many of them shared their music with CC licenses, though, which means there is indeed quite a good deal of openness involved.
In case you're just curious of what it is about, or maybe plan to contribute some music of your own, do give them a chance! I think it's a really cool idea that deserves some encouragement and recognition.