Musings on the opera A Kékszakállu Herceg Vára (Duke Bluebeard's Castle) by Béla Bartók, drama by Béla Balász _________________________________________________________________________ INTRODUCTION: THE CASTLE Philip Guston, Forms on Lock Ledge (1979) AT THE THRESHOLD of the Castle, he asks, 'Judith, why do you hesitate? Do you wish to go home?' 'I abandoned my father, my mother, my brothe…