You might be interested in Tapesonic then (a shameless plug). Streaming YouTube stuff is borked though (needs newer yt-dlp - you can try rebuilding the container yourself with a new alpine version); also grabbing non-library tracks is not supported for ListenBrainz for now (their API doesn’t return the URLs, I’ll work around this in the future; meanwhile you can still get the playlists of the stuff you already have in your library).

Yeah. That’s why I’m also adding the last.fm integration.

And you still have an option to just import whatever you want whether any metadata aggregators have it or not unlike Lidarr.

Spotify replacement? Oh, hey, that’s me.

I’m working on Tapesonic, a subsonic-compatible self-hostable streaming service. It won’t stream your local library, but it can import stuff from YouTube and Bandcamp (and probably other sites yt-dlp supports, but I didn’t bother testing) and stream those. Started making it because Lidarr can’t download basically anything and also can’t manage anything that’s not in MusicBrainz even if you download it yourself.

As for discovery - Tapesonic can scrobble your listens to ListenBrainz and, since a couple of days ago, last.fm. Those in turn provide recommendation playlists.

• ListenBrainz playlists are already incorporated, but Tapesonic can only match the songs you already have in your library - everything else is ignored; completely useless for actual discovery and the recommendations aren’t great anyway to be honest
• last.fm recommendations are pretty good and I’m actively working on importing those; last.fm provides a YouTube URL for each track and Tapesonic can import YouTube URLs - you see where this is going, yeah? I expect to push a somewhat working implementation in a couple of weeks as I already have a prototype that works surprisingly well

Caveats:

• Tapesonic is still in it’s “prototyping phase” (what do you mean it’s been more than a year since I started it…) - everything gets changed all the time, only core features get implemented, UI sucks, all that jazz
• breaking changes anytime - expect having to completely wipe everything and start anew at any moment
• no multi-user support for now and I have no idea when it’ll come; you can host multiple instances I guess

Want to give it a try?

• docker run --rm -p 8080:8080 -e TAPESONIC_USERNAME=user -e TAPESONIC_PASSWORD=pass ghcr.io/sibwaf/tapesonic
• http://localhost:8080/, username/password from the previous command (“user”/“pass” in this case)
• “New tape” -> paste any Bandcamp album URL -> “Import” -> “Add all” -> “Next” a couple of times
• Connect a subsonic client (Feishin, Sonixd, Ultrasonic for desktop, Tempo for Android) to the same address, same credentials
• Enjoy!

Any other configuration parameters, persistency, stuff like this - sorry, you’ll have to study the code. No docs and no support for now.