Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A lesson in the Blues

If you ever wanted to learn about the evolution of the Blues this is it! Some of the greatest Blues artists that have survived are in this film. It is part documentary, part performance film. Some of the performances are exciting: B.B. King, Clarence Gatemouth Brown, Solomon Burke, Odetta, Natalie Cole, Ruth Brown, etc. are all so fabulous it makes you sick that you missed this great concert. Unfortunately, there is one performance that this film could have done without. Macy Gray was in way over her head and she may have felt it. Despite this error, the film guarantees a great time for all.