Where is it written that a jazz club must be a bar? Something about the form lends itself more to lingering over dinner than the tenth beer. The jazz kicks in around 9:30 p.m., and the local jazz bands booked there play to a packed house. In the smoking section, which is closest to the stage, an open table is as rare as desert rain. One recent night a woman belted out jazzy covers of Stevie Wonder with a backing group consisting of a bassist, a drummer, a keyboardist, and a saxophonist/flutist. The notes mingled with the tastes and smells of hearty, homey fare such as the herb-roasted turkey breast in cranberry chutney sauce, cementing Mangos' stature as a culinary and musical force with which to be reckoned.