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I've settled on Navidrome for the server, and Symfonium for the player on Android (not open source). Symfonium can sync with the server so I can have all my music even when offline.

https://github.com/navidrome/navidrome

I use jellyfin and findroid or symfonium atm. Jellyfin can be slightly finicky at times but mostly just works. Don't be afraid to use the refresh metadata button though, its file watcher isn't good at picking up changes in the files' tags in my experience.

Navidrome. Built off of the old Subsonic API and works with apps that worked with Subsonic. Lightweight, simple to setup

For just music Jellyfin is overkill imo