Plex + Synfonium
Also
Navidrome + Synfonium / Tempo
I'm trying out different things in prep to switch to navidrome. I'm impressed how lightweight it is and it hasnt required much work to fix up the library tags as most were already minimally tagged.
One I figure out a secure way to expose it behind auth I'll be able to switch over.
Its been a heck of a time trying to get forwardAuth working with Zitadel so I'm trying out Authelia
What I am hoping is that I can generate an access key auth in Authelia. Synfonium supports accessKey as an alternative to basic auth for subsonic.
Maybe you could try that with caddy-security?
Synfonium is closed source, but you can use the free trial to test, and buy it outside of Google Play (which is the only reason I haven't dropped it earlier on my quest to de-Google)