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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Perform search-and-replace on text in your choice of tags
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Move selected playlists to a new or existing folder
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Copy chosen tag info from one set of tracks to a different set of tracks
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Convert selected tracks and replace them with converted versions
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Exports and then re-imports selected tracks' artwork
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Change file type to make selected AACs bookmarkable