If you want a fun romp down computer history, check out BeFS, which had basically databasing filesystem metadata. For mp3, it extracted all of the id2 metadata and then seeded the database; if you made a change it wouldn't affect the file payload.

You know, I think in the back of my head I probably thought that, but it still just gave me the heebie-jeebies.

I loved the whimsy. Felt a little like the exact opposite of a black mirror episode. Or maybe a world where