Just saw this on one of those off-brand cable channels (True-E, I think it was, something like that...) Copyright 2003, 90 minutes, Executive Producer Celia Mingus Zaentz, plenty of footage and photos, Bob Koester, Hubert Sumlin, Hubert Sumlin's "longtime wife", Wolf's daughters, Marshall Chess, Sam Lay's home movies of a night at the club, the list goes on...
If this has been discussed here previously, sorry, but how was this originally released? Don't recall any theatrical release, but I don't live in the civilized world...
Don't know how it "rates" as a piece of documentary and/or filmmaking, but it was a helluva nice way to pass an hournadahaff.