fmalover said:

I don't see how an isolated score is possible in the first place Harmy, as the film uses versions that are vastly different from the ones available on music albums, i.e. The Ice Planet Hoth is very different in the movie to the album track, plus there are music cues that can only be heard within the movie that aren't available anywhere else, such as when we are introduced to the Hoth Base we hear horn section that is heard there and there.

Those cues have all been released. Most of the music from the first three films has been released, albeit in varying quality. The Special Edition soundtracks are the most complete, but the sound quality on Empire and Jedi is awful, so there have been several projects to improve the sonics of those, of which ABC's is one of the most prominent.