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.
Display, create text file listing info of dead tracks
Remove selected tracks and Trash or delete their files
Copy files of tracks to selected folder
Change file type to make selected AACs bookmarkable
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Remove iTunes tracks disassociated from files