"Operas." . . . . . . . . . . . . . "Masked ball" . . "BALLO IN MASCHERA (A MASKED BALL) : OPERA IN THREE ACTS" . . . "Un ballo in maschera : a masked ball, opera in three acts" . . . . "Un ballo in maschera = : A masked ball : opera in three acts" . "Un ballo in maschera A masked ball, opera in three acts" . "Un ballo in maschera = A masked ball : opera in three acts" . . "Opéras Partitions chant et piano." . .