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.
For tags other than "Song Name" and "Show Name", this script may be just slightly less involved than performing a multi-edit on the selected tracks.
Also see This Tag, That Tag.
Preview each track as it will appear after applying the entered text.
Deletes the current track from all playlists and moves to Trash
Append user-entered text to beginning or ending of selected tag of each selected track
Remove iTunes tracks disassociated from files
Display, create text file listing info of dead tracks
Use tag data to formulate new file name for selected tracks' files
Displays files in iTunes Media folder not in iTunes track library