Famed Kevin Smith is "Stoked" by the fan-made duel scene..
"Oh god, with the John Williams score playing along with the duel, it is gonna be the best ten min of film ever produced.... or at least the most compelling and powerful, methinks"
its hard to say how it will work out, because lucas and ben burt like there to be no music during lightsaber duels because of the way the lightsaber sounds "almost...musical." so heres what i think about this.
at the beginning when obi confronts ani, there will be soft but sith like music and then when ani draws his saber and starts coming at obi, heart-wrenching choral music will accompany it. then as the fight goes on, the music will fade and it will be just the hum of the lightsabers whiping around which gives you the chance to connect with the characters and get closer to the action and emotion behind the fight. this also gives the audience a chance to listen closely to the dialoue. then when ani falls into the lava large choral music will arise followed by a slow and deadly imperial march.