UPDATED: Remove From Other Playlists v3.0
A Correspondent recently divulged to me that his Music library contains over 5K Smart playlists. I just had to tell somebody.
It reminds me of an old Punch cartoon showing a rather ragged gentleman with a face full of bandaids and a very shabby looking growth of beard sitting at a table writing a letter: "Dear Sirs: I have used the same razor blade daily for seven months. Is this some kind of record?"
Anyway. It's good to keep yer library nice 'n' neat in my opinion. You can start with this:
Remove From Other Playlists will load, list and examine a selection of tracks from a selected playlist in the Music app and then display the other playlists that also contain them. The tracks can then be batch-removed from any one or more of these other playlists.

Latest version:
- Initial re-release
More information for Remove From Other Playlists v3.0 and download link is here.
