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)
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Paste non-ID3 Tag track and file-related info into Category, Comments, Description or Episode ID tag
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Enter text for the selected tracks' Category tag
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Write size of track's artwork to chosen tag or copy tracks with artwork of certain size to playlist
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Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
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Change video kind and video related tags of selected video tracks
downloaded 5m 45s ago
Perform tasks on a batch of playlists; rename, delete, duplicate, merge, more