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.)