Another song idea I had a while back, but never mentioned, was this one:
http://www.dailymotion.com/video/xkp0je_nine-inch-nails-hurt-with-lyrics_music
The verse at around 1:30-ish is what I heard.
Not sure if it would go with this scene in particular, but I thought it would go with Anakin at some point. Though it's so depressing I worry that the humor may not work. BUT... the word "empire" is in the lyrics, so....