How to activate a script when not in target program?

Question

So I'm trying to make a script that will rate my itunes songs when I'm not actually in the program. I found a how-to that lets me make a keyboard shortcut to rate the song while iTunes is the active program, but I'd like to make this work at all times.
tell application "iTunes"
repeat with theTrack in (get selection)
set the rating of theTrack to 20
end repeat
end tell
Any one know how to do this? Is there a script folder I can put this where it won't matter what program is the active program?
thanks!

Answer 1

This script doesn't require iTunes to be the active application, it should work from any app if the script is placed into the system wide script menu. Unfortunately it does not work on a "selection" in iTunes which would require iTunes to be the active app so you could make the selection (catch 22). It does work on either the current track or album of the current track and can set half star ratings. Setting a rating to zero will remove it.
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try
try
tell application "System Events" to if application "iTunes" is not running then error number -128
on error
tell application "System Events" to if "iTunes" is not in (get name of every process) then error number -128
end try
set stars to {"0", ".5", "1", "1.5", "2", "2.5", "3", "3.5", "4", "4.5", "5"}
tell current application
set alb to button returned of (display dialog "Set album or track rating?" buttons {"Album", "Track"} default button 2)
set val to (choose from list stars with title "Tune Stars" with prompt "How many?")
end tell
set val to (20 * val as real) as integer
tell application "iTunes"
if alb is "Track" then
set rating of (get current track) to val
else
set album rating of (get current track) to val
end if
end tell
on error errMsg number errNum
error number -128
end try
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