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 43s ago
Send the lyrics of the playing or selected track(s) to TextEdit
downloaded 9m 41s ago
Change file type to make selected AACs bookmarkable
downloaded 23m 46s ago
Remove iTunes tracks disassociated from files
downloaded 30m 7s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 44m 3s ago
Title Cap various track tags, featuring editable exceptions lists
downloaded 1h 10m 1s ago
Use tag info from selected track to search Amazon Books for cover art