Oh, a shameless self-plug opportunity. TLDR: I'm making a Subsonic server trying to replicate a somewhat passable self-hosted Spotify/... experience.

My current setup is a Subsonic stack: gonic as a server, Lidarr as a library organizer/downloader (it works natively with Prowlarr BTW) and Sonixd/Tempo as desktop/mobile clients. Frankly, it sucks - no discovery and almost nothing gets auto-downloaded. Even ignoring the crucial discovery part, I got tired of manually downloading albums from Bandcamp - manually tagging, manually feeding files into Lidarr, manually adding metadata to MusicBrainz so Lidarr actually works, ...

So, I've been working on a Subsonic-compatible server for quite a while. The basic idea is:

• regular user libraries are already covered by various Subsonic (and other) servers, no need to reinvent this
• we can, uuuuh, cache stuff from YouTube/Bandcamp/... to stream it via Subsonic API to leverage existing clients
• we can fetch recommendation lists from somewhere else (ListenBrainz/...) and use the existing library or even auto-search YouTube/Bandcamp/... if the track's missing

Well then, what can Tapesonic already do?

• given a YouTube/Bandcamp/maybe-more URL, download it and then two-click import it as a playlist or an album, making it listenable via most Subsonic clients (single-video "mixtapes" with timecoded chapters and playlists are supported)
• combine your "main" library (from probably most other Subsonic servers like gonic/Navidrome/...) with it's own so you don't have to switch servers back and forth

What's broken/not implemented yet?

• acceptable server UI; features are far more important especially considering that the goal is to use the existing clients for almost everything
• seeking in clients; working on a fix for the past few days
• transcoding; not a priority for now
• auto-searching YouTube/Bandcamp/...; not a priority for now
• ListenBrainz playlists; I have "already listened" playlists kinda working in a stash, but those are paused until seeking works; "discovery" will just work after auto-searching gets implemented

No user documentation, half-broken, breaking changes one after another, slow progress - but hey, it doesn't mess with your existing library and already made my life quite easier with Bandcamp albums. A docker image is available - so give it a spin if you want to ~~and then ragequit because it sucks~~

I used to use Subsonic, but it's become too outdated for me sadly. I switched to a fork Navidrome which updates a few times a year and enjoy the improvements it's been providing. I use it with the mobile app Symfonium and love that they are both improving the API to add additional features and options over what Subsonic offered. I run it on my Synology in Docker so you should have no issues either.

https://github.com/navidrome/navidrome

If Tidal isn't your cup of tea, check out Qobuz - I've had a better experience with it. It doesn't pay artists as well as spotify, but I think it's still more than Spotify (iirc)

Plexamp can do all of this (not sure about mdna speakers though) and it has Tidal integration.

Finamp will also work but it lacks library/genre radio and mix support last time I checked.

I was messing around with another jellyfin/emby instance specifically for my tunes and podcasts/audiobooks.

I think the app from fdroid was fintunes or finamp or something like that. Worked okay!