Is it truly easier for you to get to a song by remembering where it came from (DLC, Lego, etc.) than to actually sort by the artist or title of the song? Or am I missing something and you regularly say, "I feel like playing something from Lego Rock Band, let's look at all of those songs in a group"?
^what he said. I think most of this is either icon/semantics OCD or complaining for the sake of it. Or maybe people are forgetting that by location isn't the only (or even close to the most practical) way to look for songs. I've downloaded enough songs that that method of sorting became useless forever ago. If you want a list of the songs, either play from the Lego disc or look it up on Wikipedia.