If you have possession of the files, I would try plexamp. Feature packed. Allows me to access all my music on my mobile devices, as easily as I play music on my desktop.
It may not be what you want, but It’s worth a look:
Yes, on Plex. That’s why I was saying that you’ll need possession of the music files. I run plex in a docker container on an old desktop and have had a wonderful experience using it. It is our go-to media server.