OS X 10.8 or later. This script will assemble two playlists populated with Music library tracks that contain, respectively, JPEG artwork and PNG artwork.
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Exports and then re-imports selected tracks' artwork
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Set the Plays of selected tracks.
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Displays files in iTunes Media folder not in iTunes track library
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Finds and displays any empty folders in the iTunes Media folder
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Move selected playlists to a new or existing folder
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Perform tasks on a batch of playlists; rename, delete, duplicate, merge, more