OS X 10.8 or later. Append the same user-entered text to the beginning or ending of the existing text in the chosen tag (Song Name, Artist, Album Artist, Album, Composer, Comments, Genre, Grouping or Show Name, and their Sort siblings) in each selected track.
Preview each track as it will appear after applying the entered text.
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Perform search-and-replace on text in your choice of tags
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Convert selected tracks and export the converted files to a new folder
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View/Edit tags of selected track(s) in single window
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Set the Plays of selected tracks.
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Re-associate batch of dead tracks with files from selected folder
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Exports and then re-imports selected tracks' artwork