Tack said:

There appears to be handful of scenes that were scored, and then subsequently cut. These are some of them, I think.

SW:

-The rear-projection landspeeder was scored, and only the tail end appears in the final film.

-I think a couple of shots of the final battle were slightly longer originally.

ESB:

?

ROTJ;

-The original opening (fully completed actually.)

-Luke's jump to the rancor pit.

-A short montage of Death Star scenes before the Emperor's arrival (the music cut is fairly obvious here.)

Does this have anything to do with the extended Battle of Yavin that Adywan implemented? I wouldn't know, I downloaded the Purist version.