UPDATE: Uncorroborated information found on the Net concerning this footage:
Leon Russell & Friends - "Homewood Session" Live at Vine Street Theatre, Hollywood, California, USA. -or- "Vine Street Theatre presents Homewood"
Originally aired in 1971 on PBS, actually KCET in Los Angeles at the Vine Street Theater on Hollywood and Vine, a theater with a little studio in the back part of the building, which is not there anymore. They shot 6 hours, but only broadcast 1 hour, unscripted and unrehearsed.
It was the first national "stereo" rock-and-roll TV broadcast - that's why Leon agreed to do it.
Billed as "Session - Leon Russell with a Few of His Friends": Don Nix Chuck Blackwell Joey Cooper Don Preston Carl Radle Kathi McDonald Claudia Linnear John Gallie Jim Horn Furry Lewis and, of course, Sweet Emily