I’m surprised to not see this suggestion, but Plex does music pretty well and they have an app dedicated for music/audio called “Plexamp”. Though I don’t think this app is on things like AppleTV/Roku(haven’t looked).

It’s so-so when it comes to playlist building…but the app on mobile works and I use it for audiobooks mainly, but I am starting to plan to use it switch off Spotify here soon.