before cache.db came into existence, you'd download all the music to your Add-Ons/Music folder.
that explains the "at least fifty songs you've never even heard of".
ah, well I loaded up someones server that said to dl music in the title, and checked my folder. Not there, so at least that isn't a problem anymore. I don't know about the crashing though, I'll uncheck "download music" and try again.