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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Switch Genre name with Album name
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Enter a date which will be appended to the comments field of selected tracks
downloaded 11m 38s ago
Append the BPM to the beginning or ending of the Song Name of selected tracks
downloaded 11m 39s ago
Convert Roman numerals in selected tracks' name to upper case
downloaded 11m 44s ago
Copy Long Description tag to Description tag of selected tracks
downloaded 11m 45s ago
Set the bookmark pointer of selected tracks to 0 seconds