It’s been nearly 50 years since Maria Callas, the most admired and photographed opera singer of the 20th century, passed away from a heart attack at age 53. If you listen today to recordings by the Greek singer known as “La Divina,” you can hear both the power and the sharp edges in her voice. She didn’t have had the most beautiful vocal instrument, but no soprano ever sang with more passion, ferocity or exhaustive preparation, and the suffering, sacrifices and heartbreak she endured in her personal life could have made for its own opera libretto. Instead, Callas’s story is told in “Master...
