Ruby Philogene, mezzo-soprano Ruby Philogene, soprano Philogenemezzosopran Marilyn Horne, mezzo-soprano Olga Borodina, mezzo-soprano Hlary Summers, mezzo-soprano Rita Gorr, mezzo-soprano Magdalena Kozena, mezzo-soprano Marjana Lipovsek, mezzo-soprano Brigitte Fassbaender, mezzo-soprano