Shout out for mStream - the simplest and best cloud music server.

Low dependency count, very low overhead, no fees or ‘premium’ options like Plex and co. - just a simple html or api to app interface to your music, with optional transcoding (one setting for the whole server, if there was one complication I’d add to mstream it would be per-user transcoding options)

Works great with super large libraries.

Only big caveat i’ve noticed, is that it sends the albumart every track, so if you’ve got some music with a 1500x1500 ~500-1500KiB coverart, it’ll eat your data a bit more than it should. Obviously this doesn’t matter if you’ve got unlimited mobile data.