I have a ton of songs that I classify in named playlists, and would like to have an easier way of knowing if a song has been previously classified or not. The thought occurred to me to make a Smart Playlist that will show me songs that meet the following requirements:
- Media Type must be Music (excludes Music Videos, Movies, TV Shows, Books, Podcasts, etc.)
- Must not exist in any playlist within the parent Classification folder.
- Must not exist in the "Unclassifiable" folder.
I can't get the Smart Playlist to populate with all remaining songs:

Is it possible to create a Smart Playlist showing all songs not in another playlist?
