I've got probably a few thousand mp3s from there and other services (lots of eMusic samplers) that now have little to no context. Sorting through them lately, it's a tad depressing when I hear a really great song and can find almost no information about the band that made it.

Also heavily used drip.fm. When Kickstarter decided to change the service to Patreon-lite I asked about archiving the site because of all of the extra info (forget about the music, I wanted the metadata). They told me they couldn't do it.