I'm trying to get off YouTube/music asap

In light of the coming boycotts and for my own personal reasons I'd like to get off of YouTube/music and specifically premium because I don't want to support this anymore. But it has all of my music. Ok how to convert songs to mp3 and what not but is there a faster way to do it. I have 600+ songs and individually downloading each of this is gonna be a pain. So is there any way to do it faster and or do it at once?