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.
Apply selected CD's CD Text to its disc and track tags
Exports and then re-imports selected tracks' artwork
Set the Plays of selected tracks.
Create a PDF booklet containing info from the selected tracks
Displays files in iTunes Media folder not in iTunes track library
Display, create text file listing info of dead tracks