If you have at least a slight interest in the blues and rock-and-roll, which I do, this movie is a delight. It skillfully avoids the usual trap of high spirits at the beginning leading to a sorrowful drug-filled ending. Along the way, the impersonations of Muddy Waters, Chuck Berry, Howlin' Wolf, Etta James and others are absolutely wonderful.
This is a sad, sad, sad, wonderful, wonderful, wonderful movie. The direction, the acting, the art direction, the storytelling is pitch perfect—but you have to be in the mood for a real punch in the stomach. I wasn't, but this is still one of the best movies I've seen this year.