OS X 10.8 or later. This applet will create new Music track playlists based on each selected entry of a specified tag. That is, create individual playlists for each Artist, Album Artist, Album, Composer (or their "Sort" siblings), Genre, or Year.
A good companion to this applet is Merge-Delete Playlists.
A new playlist will be created for each checkmarked entry and will contain Music tracks--in this case--whose artist tag is the same as the entry. The red-colored entries are already playlists.
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Continuously display playlists containing selected/playing track(s)
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Locates pairs of track entries pointing to the same file
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Gather audio tracks whose files contain no artwork metadata
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Restore each selected track's artwork from an image file stored in its Album folder
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Remove iTunes tracks disassociated from files
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Exports and then re-imports selected tracks' artwork