Maria Callas was a Greek-American opera singer who is widely regarded as one of the greatest sopranos of all time. She was born in New York City in 1923 and began her career in Greece in the 1940s. She went on to become an international star, performing at some of the world's most prestigious opera houses. Her repertoire included works by Verdi, Puccini, and Bellini, among others. She was known for her powerful voice and dramatic interpretations of operatic roles. Callas died in 1977, but her legacy lives on in the world of opera.