Jazz programs on network television are as rare as unicorns, so the fact that two will air next week on PBS--one on Monday, Feb. 27 and another on Saturday, March 3--is noteworthy. Cab Calloway All Rights Reserved/Artline Films/J.-F. Pitet "Cab Calloway: Sketches" premieres Monday, Feb. 27 on PBS's American Masters. Full of hot-cha razzmatazz and hi-de-ho, it's an intriguing portrait of singer, dancer, bandleader, and movie star (Stormy Weather, The Blues Brothers) most people today know…
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