Editing
The cues recorded by Williams for the Star Wars movies are not always heard in their original forms. In cases when a scene was re-edited after the recording process, the music was edited to reflect the changes. Such edits sometimes carry over into the soundtrack albums and sometimes do not.
Williams will also record the same cue several times. These different takes will then be assembled to form one "ideal" take of the cue which is then used in the film.
Improper notation or the loss of documentation, however, led to an array of incorrectly edited album releases, using alternate takes not meant to be officially used.
With the advent of modern technology and editing techniques, the prequels took the ability to re-construct the music to an extreme. Williams and Lucas however did decide where some tracked music would be used and would leave the scene open for the music (such as "Escape from Naboo" from Episode I and in Episode III as the Invisible Hand falls from space).
However, further editing usually took place past what Williams had intended.
Read more about this topic: Star Wars Music
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