On May 17, 1980, BBC2 aired a documentary, STAR WARS: THE MUSIC BY JOHN WILLIAMS, which focused on the scoring of THE EMPIRE STRIKES BACK. It has since been uploaded to YouTube for your viewing pleasure, here:

Chapters:
00:00 – Intro / Production crew / A New Hope
06:05 – EMPIRE: spotting sessions
07:15 – “How to Steal a Million” (1966)
11:45 – “A Guide for the Married Man” (1967)
13:08 – EMPIRE: spotting sessions (cont.)
15:40 – EMPIRE: kiss scene comparison
18:48 – “Images” (1972)
21:40 – “Jane Eyre” (1970)
24:59 – EMPIRE: sound fx (with Ben Burtt)
29:00 – “The Towering Inferno” (1974)
31:32 – John Williams personal views
34:05 – Steven Spielberg interview
35:45 – “Jaws” (1975)
38:15 – “Close Encounters of the Third Kind” (1977)
42:41 – “Superman” (1978)
45:45 – EMPIRE: music writing and editing
52:00 – EMPIRE: recording sessions
56:28 – EMPIRE: final cut with music / End Credits

VHS recording. Source: myspleen. Upscaled to HD.

Copyright Lucasfilm Ltd and BBC, 1980.