OS X 10.8 or later. This applet will assist with swapping, copying, and appending data between two user-chosen tags in selected tracks or tracks in the selected playlist:
Swap - swap data between tags, ex: ARTIST<->COMPOSER
Copy - copy data from one to another tag, ex: ARTIST->
Append - append data from one tag to the end of another, ex: ARTIST->COMPOSER - ARTIST
Prepend - prepend data from one tag to the beginning of another, ex: ARTIST->ARTIST - COMPOSER
The latter three actions also provide an option to delete the info from the first tag after the copy. Read Me explains all.
This update is free for registered users of v4.x.
Select the Action to perform between the two chosen tags in each selected track.
Perhaps of Interest...
downloaded 5m 45s ago
Removes leading and trailing space characters from chosen tags in selected tracks
downloaded 14m 54s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 16m 0s ago
View/Edit tags of selected track(s) in single window
downloaded 19m 54s ago
Copy chosen tag info from one set of tracks to a different set of tracks
downloaded 23m 48s ago
Apply selected CD's CD Text to its disc and track tags
downloaded 24m 2s ago
Search Wikipedia using the Song Name, Album, Artist, or Composer of selected or playing track