All the ones I’ve found appear to be dead.
I’d be particularly interested in a community where people listen and offer feedback on each other’s projects, allow you to promote your released music and network with each other. Reddit has r/wearethemusicmakers and r/indiemusicfeedback which are thriving and positive spaces, for example. I just haven’t seen anything like that here l, at least nothing that’s caught on.
Fellow musicians, where we at???
[email protected] is the most-active that I subscribe to.
General solution for finding communities: use https://lemmyverse.net/communities to search the whole Threadiverse. They index all the communities out there, on all instances, so they can even find communities that your home instance doesn’t yet know about.
EDIT: I’d also add that to my non-musician/sound engineer eyes, [email protected] does have subscribers providing technically-sound answers when people post. But it doesn’t have a lot of people posting. @[email protected], @[email protected], and @[email protected] are clearly trying to stimulate more conversations by posting periodically, but if more folks interested in music posted there, that’d probably benefit the existing subscribers too.