Good that you caught that. I once read of Lucas and Williams and the original Star Wars music where it stated that Lucas specifically wanted wall-to-wall music. His previous experience with American Graffiti was to make an environment of a time and place. Clearly, he liked it and continued it, only bigger, in Star Wars.

Forgive my over-thinking this but … what about traditional Japanese instruments (Shamisen) playing Star Wars? 😄

Opening Titles
Opening Titles continued - more instruments
The Dark Side
Cantina
The Throneroom
End Titles - more instruments

… and you could cross-fade between Shamisen and full Star Wars symphony (it would probably work best only at the start and end of the film).