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.
Re-locate files of selected tracks to new folder, preserve track meta-data
Sort purchased tracks into discrete playlists by name or account ID
Exports and then re-imports selected tracks' artwork
Locates pairs of track entries pointing to the same file
Automatically check CDs for tracks not previously imported and then import them
Change the settings of hidden iTunes preferences