Jonno said:
The thing is, duels (lightsaber or otherwise) can have significance other than 'exciting' and 'cool'. It's understandable that the Episode I clash would be scored with exhilarating choral music, because it's a visually spectacular duel with relatively low stakes.
But the later battles (each of which involves Anakin or Vader, by the way) have increasingly more complex emotion behind them - they're still epic, but in a different way. I personally feel that 'Battle of the Heroes' is a bungled choice; it shouldn't be a loud and energetic piece of scoring at all, given that the Episode III duel is the tragic climax of the saga.
But moving on to the OT, the scoring is just right as it is - in Star Wars the very idea of a lightsaber battle was new, so it's understandable that scoring wasn't felt necessary until the very end; the (carefully edited) music in the ESB duel beautifully captures Luke's fear and heartbreak; the climactic Jedi clash is scored with one of the finest pieces in the whole saga (a truly epic cue if every there was one).
To plaster these scenes with pounding action music would be to completely miss the point.
That's fine, however in my opinion the duel of Bespin would work very well with action music, a portion of used it did too, the middle portion, with The Clash of the Lightsabers. Without Duel of the Fates it still works but not much would change. Duel of the Fates gives more excitement to it in my opinion. My video shows how it can be edited. It's the revelation of Vader being Luke's father where the true emotion comes in my opinion, so I had no problem with adding music to Empire. The problem with adding music actually comes in Return of the Jedi. If you had added Duel of the Fates (or any other exciting music) would rob it's emotion, his dilemma of fighting his father, falling to the Dark Side etc. So if I added it to Return of the Jedi I would agree with you that adding music would rob the emotion from the fight. But here I don't agree you completely. But that's fine, no problem if you disagree.