This script will apply the same user-entered text to the "Description" tag of each of the selected tracks.
iTunes 12 no longer provides a way to edit the Description tag of tracks in the Get Info panel for a multiple-selection of tracks.
The text you enter will be applied to the "Description" tag of the selected tracks.
Perhaps Also of Interest...
downloaded 2m 22s ago
View/Edit tags of selected track(s) in single window
downloaded 39m 45s ago
Copy chosen tag info from one set of tracks to a different set of tracks
downloaded 49m 27s ago
Convert selected tracks and export the converted files to a new folder
downloaded 56m 45s ago
Export selected playlists as individual XML or M3U files
downloaded 1h 15m 39s ago
Remove iTunes tracks disassociated from files
downloaded 1h 22m 46s ago
Droplet adds files, creates playlists based on folder name(s)