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 2m 10s ago
Search for lyric sites with Google using info from the current or selected track
downloaded 5m 5s ago
Move selected playlists to a new or existing folder
downloaded 11m 56s ago
View/Edit tags of selected track(s) in single window
downloaded 17m 19s ago
Use tag data to formulate new file name for selected tracks' files
downloaded 17m 30s ago
Two scripts copy text from clipboard to current or single selected track's lyrics tag
downloaded 19m 57s ago
Exports and then re-imports selected tracks' artwork