Lidarr is all you need.

You can do other methods, but this one is simple and effective. Set it up, tell it what bands you like, wait a day and you've got the entirety of your childhood favorites and nearly every discography you can think of. All for maybe an hour of upfront work.

Versus remembering every band/song you ever liked, tracking it down, downloading each individually... Like yeah, you can do that. It's what I do for shows and movies for curation. But for music, I have so much and so many that curating like this just isn't as worthwhile as checking off a band in Lidarr and having all of their stuff in a few hours.