The result is a very modern, expressionistic retelling of the ancient Greek myth. These changes tightened the focus on Elektra's furious lust for revenge. Other facets of the ancient story are completely excluded, in particular the earlier sacrifice by Agamemnon of his and Klytaemnestra's daughter Iphigenia, which was the motivation for Klytaemnestra's subsequent murder of Agamemnon. Various aspects from the myth are minimized as background to Elektra's character and her obsession. (The order of these conversations closely follows Sophocles' play.) The other characters are Klytaemnestra, her mother and one of the murderers of her father Agamemnon her sister, Chrysothemis her brother, Orestes and Klytaemnestra's lover, Aegisthus. Hofmannsthal's and Strauss's adaptation of the story focuses tightly on Elektra, thoroughly developing her character by single-mindedly expressing her emotions and psychology as she meets with other characters, mostly one at a time. While based on ancient Greek mythology and Sophocles' tragedy Electra, the opera is highly modernist and expressionist in style.