When 2001 was made, it was completely scored by ... ahh ... lemme find it ... Alex North, and was all done when Kubrick randomly thought, "Hey, I played classical music on the set - I like that better" and went with classical music. North's unused score has since been released. This is probably what Trooperman is talking about.
Onto other things - I agree, and mentioned before, that lightning should not appear in any way, shape, or form until ROTJ. I could never figure out how to make it work until you mentioned it, which works perfectly (as in, getting Anakin out of the fight). I look forward to seeing this edit.