For macOS 10.10 and 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, Show Name (or their Sort siblings), Work or Movement--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