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.
For OS X 10.8 or later only. This update is free for registered users of v4.x.
Select the Action to perform between the two chosen tags in each selected track.
Export artwork of selected tracks to parent or specified folder
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Rename selected tracks' Song Names with their filenames (minus extension)
Set the Plays of selected tracks.
Append user-entered text to beginning or ending of selected tag of each selected track
Set choice of various number tags of selected tracks incrementally