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.
Re-associate batch of dead tracks with files from selected folder
Display, create text file listing info of dead tracks
Copy chosen tag info from one set of tracks to a different set of tracks
Add or subtract a user-entered number from each selected track's Skip Count
Rename selected tracks' Song Names with their filenames (minus extension)
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags