There’s also Funkwhale, but that’s more of a self hosted, federated SoundCloud alternative I think.

It’s also primarily for self-publishing. When sharing music that’s not your own I suspect you quickly run into the same issues as with torrents. With probably similar solutions.

I’ll check out Spotube and SimpMusic, although the local music part is missing from your description.

Currently using lidarr for library management and… err… acquisition.

Not sure what plex can do for playback/streaming. Looked at it for video streaming, but ended up not using it.

Ooh, that looks interesting. Thanks.