OS X 10.8 or later. Copies your single choice of filename, file path (location), file's parent folder path, file creation date (YYYY-MM-DD HH:MM:SS), current playlist, volume adjustment, start time or stop time (HH:MM.SS), artwork size (WxH), purchaser name or purchaser account ID to choice of Category, Comments, Description or Episode ID tag of each selected track. By putting data in one of these available tags it can be visible and sortable or used with Smart Playlist criteria.
I've kept the word "Comments" in the title of this script for legacy purposes, even though modern versions of it can write to other tags.
Choose the information to use (left) and then choose the tag to copy it to.
(via in-app purchase)
Perhaps Also of Interest...
downloaded 2m 56s ago
Set the Album Rating for the album of a selected track to full- and half-stars or computed clear-stars
downloaded 5m 25s ago
Exports and then re-imports selected tracks' artwork
downloaded 24m 3s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 41m 40s ago
Restore each selected track's artwork from an image file stored in its Album folder
downloaded 48m 37s ago
Renumber order of selected tracks
downloaded 1h 2m 6s ago
Gather audio tracks whose files contain no artwork metadata