Magic PotionFor their farewell to the Fat Possum label, Black Keys released the six track EP CHULAHOMA, a tribute to the late Mississippi hill country bluesman Junior Kimbrough. While previous Keys albums made clear the Akron, Ohio, guitar drums duo's genuine devotion to the blues, none seemed to come from the soul quite like the brief tribute to their mentor. 2006's MAGIC POTION, however, speaks from a similar place. While the Keys still happily evoke vintage