Best free seedbox app built exclusively for music apart from Plex, Emby and Jellyfin?

Hello everyone,

as you can read from the title of this topic, I'm looking for a valid alternative and free app here on my seedbox on seedboxes.cc to manage my huge music library I have in my Google Team Drive.

I'm searching for it because apparently the Music library I have on my PMS here on my seedbox doesn't cope well with the standard Plex app for Android and Apple devices (it can't play any track at all); for reference, with my domestic PMS there is no such an issue, and the app just does the work correctly.

Some people suggested me apps like Subsonic, which, from what they said to me, is the best free alternative to things like Plexamp (which it's awesome but needs an active Plex Pass subscription in order to work).

What do you guys think? Should I give Subsonic a try? Or maybe is there even a better app?

Thank you in advance!