Don't let the "Blues Boy" fool you--Artie White is no slavish B.B. King imitator but an important veteran vocal stylist in his own right. He specializes in a soulful, horn-drenched contemporary blues sound, the requisite combination of dusky soul passion and blues fire, and his warm professionalism provides a welcome contrast to the arrogant superstar strut affected by many of his contemporaries. White's originals are well crafted and deeply emotional, and his versions of standards sometimes become definitive: "Jimmie," an impassioned remake of Little Beaver's "Joey" that White recorded in 1985, has become a mainstay on the Chicago scene, a staple in the repertoires of Magic Slim, the brilliant but short-lived band Hurricane, and several others. For all his influence, however, White has found it hard to extend his Chicago reputation beyond the south side. Tonight and Saturday, Checkerboard Lounge, 423 E. 43rd; 624-3240.