LMS

Almost instantly fell in love with this, because it groups albums by album name only, i.e. I don't really care if the album has many different artists, if I need that kind of detail I'd be hanging out in the Artist tab instead.

Compare Navidrome (left) vs LMS (right):

Navidrome definitely more feature-full for the power user, but really the basic functionality + possibility of Subsonic API is all I needed.