OS X 10.8 or later. This script will look for an image file in the parent folder of each selected track's file--presumably its Album folder in which you have previously placed an image file of some sort--and apply the data from that image file as artwork for the track.
Export selected playlists as individual XML or M3U files
Perform search-and-replace on text in your choice of tags
Deletes the lyrics of every track in the Music playlist
Export album artwork as folder.jpg to Album folder
Restore each selected track's artwork from an image file stored in its Album folder
Export artwork of selected tracks to parent or specified folder