oh man, I started with iTunes Match because that's the only service that I could use to backup all my MP3s, and now it's all messed up and so much music has just disappeared from my playlist... so sad.

Unfortunately I still don't know a service I can use that will allow me to sync my current MP3s / what I have in Apple Music, and export it if I need it. There's really an issue of owning data and being able to take it elsewhere :/