PITTSBURGH OPERA The Passion of Mary Cardwell Dawson ONLY TWO PERFORMANCES LEFT! Pittsburgh's unsung heroine who taught America to sing May 3 & 5, Byham Theater Tickets $15+. Kids and teens half-price pittsburghopera.org/trib PITTSBURGH OPERA The Passion of Mary Cardwell Dawson ONLY TWO PERFORMANCES LEFT ! Pittsburgh's unsung heroine who taught America to sing May 3 & 5 , Byham Theater Tickets $ 15 + . Kids and teens half - price pittsburghopera.org/trib