While it's not strictly historically accurate, the movie Cadillac Records captures the major moments in the history of Chess records and its legendary blues titans. While Jeffrey Wright and Beyonce Knowles have gotten alot of critical notice, and for good reason, especially in Wright's case, it was Eamonn Walker's portrayal of Howlin' Wolf that stole the show for me, though he was afforded only a minor part in the film, which really follows the careers and relationship of Muddy Waters and Leonard Chess as the main storyline.
Here is Walker's rendition of Smokestack Lightnin' in the film. His performance of Howlin' Wolf's inhuman growl is even more startling if you hear the actor's natural, fairly refined London accent.
I enjoyed the film so much, I watched it twice in a row on a flight from Tokyo to D.C..