Buddy Guy with David Myers (on bass) from the movie Chicago Blues (1970) --which I can not seem to locate, after much effort. Great 70s Chicago visuals!
Buddy Guy - First Time I Met The Blues
~*~
I know I've shared this one before. Time for a reprise!
Cream - Born Under A Bad Sign
~*~
Grateful Dead - Cassidy (Unplugged- Live) - 09/24/94 - Berkeley Benefit
One YouTube comment says this was actually a "Phil Lesh and friends" performance that included Bob, Jerry and Vince Welnick.