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 Scripts.
Preview each track as it will appear after applying the entered text.
Make a text file listing Albums that have some/no tracks with artwork
Remove iTunes tracks disassociated from files
Copy chosen tag info from one set of tracks to a different set of tracks
Swap the name with the artist of selected tracks
Change file type to make selected AACs bookmarkable
Set choice of various number tags of selected tracks incrementally