I'm gonna second Soulseek. It is pretty old, but so many of the people who use it are collectors who organize their collections well, and I've found some pretty obscure stuff on there as well.

I haven't tried it myself, but I want to try Soularr, which apparently lets Lidarr use Soulseek as a source.

as everyone else has said soulseek and nicotine+.

If you want to get your spotify playlists from soulseek use this script: https://github.com/fiso64/slsk-batchdl

basically you export your spotify playlists as a csv and slsk-batchdl will take that and try to find everything on soulseek and download it for you. anything it can't find it'll let you know. it might take awhile, if you have a server I'd run it on that via screen and just let it run overnight (that's what I did)

Keep in mind that Soulseek has A LOT of audiophiles on it so you'll find a lot of high quality audio and FLACs. if FLAC is too big for you and you're fine with mp3s you c an use Nicotine+ to just search for mp3s.

Not a torrent site but Soulseek/Nictone+ is a very old school Limewire-style service that you can curate with friends lists and choosing what to share and not share.

Orpheus is dedicated to music, and one other one which I forget the name of. It's kind of interesting how music trackers were what made torrenting explore originally but not music trackers are often an afterthought.

Everyone has already suggested soulseek, so I will also add that on rare occasions I've been able to find downloads with Yandex that I couldn't find on soulseek or anywhere else.

Soulseek, but also redacted.

+1 for Soulseek. Torrents for music tend to be very hit and miss.

slskd if you use containers.

Try OuterTune (available on F-Droid). It's a YouTube Music client without ads. And YT Music itself can be used with uBO.

Learn an instrument. Jam with the locals. Fuck the music businesses and inflated concert prices. Serve yourself. /s

Why doesn't anyone started up an open source Soulseek like network?