Olga Borodina is a Russian mezzo-soprano opera singer who has performed in many of the world's leading opera houses. Marilyn Horne is an American mezzo-soprano opera singer who has won four Grammy Awards. An ALTO is a type of classical singing voice that is lower than a soprano and higher than a tenor. FLORA Bervoix is a character from the opera La Traviata by Giuseppe Verdi. An ARIA is a self-contained piece for one voice, usually with orchestral accompaniment, from an opera, oratorio, or cantata. Stade is a French word meaning 'STAGE'.