February 1970.  I saw the band four times in Feb. 1970 and they did Hoochie Coochie Man with Berry singing. Duane played a Goldtop Les Paul I assume is in the Big House museum now and Derek and others have played it in shows. Dickey was on a Stratocaster in February 1970. Dickey plays the first solo and by the tone I think it's the Strat tone he had then. 

And here is Muddy!! Happy birthday to both!!! 

Of course Willie Dixon wrote Hoochie Coochie Man. Here is Willie popping a stand up bass. Real fine playing.