If you think of an album like it were any other pack, it makes more sense.  Originally we only had the pack name, so we recorded it in with the others. (As I would argue that the albums section is actually better used as a place for Packs/Albums with no confirmed contents).  But then later we were given a full list of tracks that were being included.  So look at the current "Singles" table as a group of songs that are also happen to be available as a pack called Ten.   T / C