Our World included the opera singer best known for what technique?
Maria Callas Maria Callas, Commendatore OMRI (Greek: Μαρία Κάλλας ; December 2, 1923 – September 16, 1977), was a Greek-American soprano, and one of the most renowned and influential opera singers of the 20th century. Many critics praised her "bel canto" technique, wide-ranging voice and dramatic interpretations. Her repertoire ranged from classical "opera seria" to the "bel canto" operas of Donizetti, Bellini and Rossini and further, to the works of Verdi and Puccini; and, in her early career, to the music dramas of Wagner. Her musical and dramatic talents led to her being hailed as "La Divina".
William Ludwig (singer) William Ludwig (born William Ledwidge) (15 July 1847 – 25 December 1923) was an Irish operatic baritone who rose to fame in the second half of the nineteenth century. He was famous as an interpreter of Wagner, becoming in Britain and the United States the definitive Dutchman. He later became an equally famous concert artist. His most active period was from 1874 to 1908.