This doctoral project involves a multi-disciplined analysis concerning Agamemnon's daughters (Iphigenia, Electra, and Chrysothemis) and how these women's gender and virtues were depicted as compared with ideal Greek women in antiquity. Three composers in three different eras adapted the literary and musical depictions of these women based on the composer's society, culture, audience expectations, musical climate and personal goals. George Friedrich Handel's Oreste (1734), Christoph Willibald von Gluck's Iphigénie en Tauride (1779) and Richard Strauss's Elektra (1909) are the main operas used for this analysis. The Mycenaean House of Atreus, a dynasty which the ancient Greeks traced back to the time of the Trojan War in the 12th century BCE, figures prominently in Greek mythology and ancient Greek literature concerning the Trojan War. The House of Atreus included Agamemnon, King of Mycenae and commander of the Greeks at Troy, his wife Clytaemnestra, their son Orestes, and their daughters: Iphigenia, Electra, and Chrysothemis. For over three thousand years, the legend of this ancient family has inspired musical scores, plays, poetry, architecture, sculpture, paintings, and movies. Numerous studies examine the varying interpretations of the House of Atreus myths; few, if any, address the ways in which female Greek virtues are depicted operatically within the myths. In the music of Handel's Oreste, Gluck's Iphigénie en Tauride and Strauss's Elektra, Agamemnon's daughters contradict the ideal Greek woman while still exhibiting heroic or idealistic virtues. The analysis of the operas in their social contexts will address the audience expectations and composers' dramatic interpretations of the myth. This analysis will include: a brief overview of ancient Greek culture and gender roles; a literary comparison of the original dramas to the librettos; societal audience expectations in their historical contexts; musical, philosophical, and literary influences on the composers; and an examination of music composed in two different centuries and in three different styles. The brief historical, cultural, literary, and musical analyses highlight the absence and presence of ancient Greek virtues, and how these women can be presented both as heroic, or virtuous, and unvirtuous in the same production.