sentences:  The play opened on Broadway in 1995, with stars Zoe Caldwell and Audra McDonald winning Tony Awards.The opera diva Maria Callas, a glamorous, commanding, larger-than-life, caustic, and surprisingly funny pedagogue is holding a singing master class.Alternately dismayed and impressed by the students who parade before her, she retreats into recollections about the glories of her own life and career.