The database isn't set up to properly support digital non-game items like these at the moment. There's no categories or item types for them, and I haven't really created any submission guidelines to handle them either.
I do want these items to be added and catalogued here (my legit digital music collection is HUGE). What I don't want is random users adding anything they get off an illegal torrent or file sharing site as a legit item when it's not*. We have enough problems with people who add game hacks or other unlicensed, download-from-the-internet-and-burn games to the site...
* = There are legitimate uses of torrents and file sharing sites, and some devs / people use these to distribute stuff legally.