With "Cadillac Records," first-time feature film writer/director Darnell Martin tries to tap into that "Ray" and "Walk the Line" groove with the story of white entrepreneur Leonard Chess (Adrien Brody) building a recording empire in Chicago in the 1940s and 1950s by producing "race records" with black blues legends Muddy Waters (Jeffrey Wright), Little Walter (Columbus Short), Howlin' Wolf (Eamonn Walker), Etta James (singer Beyonc

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