Watch Online Free on Watchseries. Legendary opera singer Maria Callas had an extraordinary career, colored as much by supreme success as it was by terrible heartache. Yet despite her tumultuous private life, Callas's powerful soprano voice rarely faltered. Narrated by Rosalie Crutchley, this well-rounded documentary features extensive interviews and numerous performances, including the diva's final concert in Tokyo and a rare recording taken a class at the Julliard School.