Master Class BOISE, ID (idaho) - La Divina. Maria Callas was one of the most renowned opera signers of the twentieth century. She is also the eye of the storm that is the play, "Master Class," presented by the Boise State University departments of music and theatre arts, partnering with Opera Idaho. Boise State Radio's George Prentice gets a preview from the cast. © Copyright 2012, idaho