Copy Grouping to Work
As you probably know, the latest beta version of iTunes 12.5 includes Work and Movement track tags which Classical music listeners will appreciate. In many cases, you might want to use the text in the Grouping tag for the Work tag. While it might seem easy to just do a Multi-Edit on the tracks and copy-and-paste using the Get Info fields, you'd only be able to do this for individual batches of a single work at a time.
Here's an AppleScript that will simply copy the Grouping tag to the Work tag for any number of selected tracks:
tell application "iTunes"
set sel to selection of front browser window
if sel is {} then return
repeat with aTrack in sel
try
tell aTrack to set work to (get grouping)
end try
end repeat
end tell
Save this named whatever you like to your [home]/Library/iTunes/Scripts/ folder so that it will appear in the iTunes Script menu. Select some tracks and launch the script by selecting it from the Script menu. The text from the Grouping tag, even if it's blank, will be copied to the Work tag of each selected track.
UPDATE: This script can be downloaded as part of the Work and Movement Scripts.