 Eliot employs the myth to depict themes of sorrow, pain, and that the only recovery or regeneration possible is through revenge.Several of these mentions reference other poets' renderings of the myth, including those of Ovid and Gascoigne.Eliot's references to the nightingales singing by the convent in "Sweeney and the Nightingales" (1919–1920) is a direct reference to the murder of Agamemnon in the tragedy by Aeschylus — wherein the Greek dramatist directly evoked the Philomela myth.