Greek Tragedy / Musical Theatre / Opera / Early 20th-century Music / Ernst Krenek / Austrian music / Operngeschichte / 20th century Opera / Opera librettos / Tragedy and the Modern World / Zwischenkriegszeit / Librettology / Austrian Opera / Austrian music / Operngeschichte / 20th century Opera / Opera librettos / Tragedy and the Modern World / Zwischenkriegszeit / Librettology / Austrian Opera