Margarethe Arndt-Ober (b. Berlin, April 15, 1885–d. Bad Sachsa, March 17, 1971) was a German opera singer who had an active international career during the first half of the twentieth century. A highly skilled contralto, Ober enjoyed a particularly long and fruitful association with the Berlin State Opera from 1907 to 1944. She also was notably a principal singer at the Metropolitan Opera in New York City between 1913 and 1917.
Ottilie Metzger-Lattermann also formerly Ottilie Metzger-Froitzheim (15 July 1878 – February 1943) was a German contralto who was a famous performer of works by Wagner during the 1910s, and who after her retirement was murdered in Auschwitz.
Hertha Töpper (German: ['hɛrta 'tœpər]; 19 April 1924 – 28 March 2020) was an Austrian contralto in opera and concert, and an academic voice teacher. A member of the Bavarian State Opera, she appeared in leading roles at major international opera houses and festivals.