Wearing a retro dress and tall boots, posing for pictures, petite Fridley practically begs the adjective "cute." Add to that her character-rich singing voice, baring some similarity to essayist Sarah Vowell. But when Fridley launched into the blues standard "Rollin' and Tumblin,'" her high notes took on a dangerous edge and her low tones a menacing growl. Martin set a brisk pace with brushes on snare, lending a spooky, renegade feel — more J.J.Cale than Muddy Waters. Fridley herself is a bit ...