This script will remove all replications of the selected tracks (or all the tracks in the selected playlist) from every other user-created playlist (ignoring Smart, Genius and Media Library playlists). The original tracks will not be removed from the selected playlist.
Also see Copy Tracks to Multiple Playlists.
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Copy chosen tag info from one set of tracks to a different set of tracks
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Displays files in iTunes Media folder not in iTunes track library
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Exports and then re-imports selected tracks' artwork
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Export selected playlists as individual XML or M3U files