What you’ll end up doing is creating a small script for each of the libraries you’ll want to access. Here’s the script for the Music library:

tell application "iTunes"
	try
		set view of front browser window to (get some playlist whose special kind is Music)
	end try
end tell

Some might suggest using this syntax instead:

		set view of front browser window to playlist "Music"

That’s fine, too. I just prefer using special kind to avoid any ambiguity. Save that as “select_music.scpt” in your ~/Library/iTunes/Scripts/ folder so it will appear in the iTunes Script menu. Now, assign the script a “Command-1″ keyboard shortcut.

I think you can see where this is going. You’ll create a “select-movies.scpt” and assign it “Command-2″, and so on. The special kind parameters for other libraries are Books, iTunes U, Movies, Podcasts, and TV Shows. For other libraries you may have to use the name parameter.

tell application "iTunes"
	if selection is {} then return
	set strm to (item 1 of selection)
	if (get class of strm) is not URL track then return
	repeat
		try
			play strm
			exit repeat
		on error m number n
			delay 15
		end try
	end repeat
end tell

The earlier script used the open location command, errors from which could not be defeated with the try block.