‘Star Wars: Music by John Williams’:-
https://www.youtube.com/watch?v=6eWqxlCNnKE - at the Neil Bowyer youtube channel. (A 1980 documentary - 60 mins)
The blurb:-
“BBC documentary showing John Williams’ writing, recording and editing process for the soundtrack of The Empire Strikes Back, as well as discussions about his earlier works as a composer of the 1960’s and 1970’s. Mainly served as a way to build up hype for The Empire Strikes Back, but it was insightful and comes recommended for fans of Star Wars and Williams’ music.”