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.
Perhaps of Interest...
downloaded 14s ago
Set choice of various number tags of selected tracks incrementally
downloaded 1m 14s ago
Exports and then re-imports selected tracks' artwork
downloaded 27m 44s ago
Display, create text file listing info of dead tracks
downloaded 30m 28s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 30m 58s ago
Remove iTunes tracks disassociated from files
downloaded 48m 6s ago
Re-locate files of selected tracks to new folder, preserve track meta-data