I have a folder of MP3s, some of which date back to 1999, just a few years after the format was popularised. Most of them have utterly terrible names (think RIDEONAM.MP3). I think at this point they might even survive the heat death of the universe. And they’ll still be terribly-organised.
Everything I could find that was of higher quality, I downloaded over time. I have some bootlegs though along with some music I’ve found from no other sources. I’ll never replace some of it, but that’s fine.