The Washington Performing Arts Society (WPAS) is presenting an exciting double bill of adventurous piano-based jazz this Sunday at Lisner Auditorium. Performing will be The Bad Plus (pictured right) and pianist Jason Moran (pictured below), two acts who consistently refuse to be limited by traditional notions of what a jazz performance should or should not be. Moran and The Bad Plus have played together on the same bill before and, unsurprisingly, their common outside-the-box approach…