Basically "Tag Layer" specifes that for each unique value of the selected tag, you want a playlist, which means that for "title" you would have a playlist with the title as the name and all the songs with the same title would be put in it. Currently there's not a particularly nice way to get All -- however, I saw someone use a search soup where the search criteria was "refs" (meaning anything whose refs is not equal to "", which is everything). That will match playlists though, so what you probably want is "type=tune" as a search... I think that will show only the tunes.