Don’t read unless you remember what burning a CD was or if you want a viable answer
spoilerA self curated mp3/opus folder with everything sorted into sub-folders, and a playlist folder that you can mess with on the fly I’m still surprised all my music fits < 1GB by a large margin. Less than 2GB if you include full video game sound tracks. If I ever want to add anything, I usually use ytp-dlp and download from whatever source (usually youtube). Everything autosyncs to any of my devices with syncthing, which incidentally is also useful for photos. But tbf this doesn’t introduce you to new stuff. That I just do by random chance by watching yt videos and crap. YT Music is just as bad and will loop the same 3 songs if you let it.