The Robbers
Klebe was inspired and influenced by works of authors and artists, especially his contemporaries. In 1951 he composed "Die Zwitschermaschine" Op. 7, ("The Twittering Machine"), based on the painting by Paul Klee. His first opera, based on Friedrich Schiller's play "Die Räuber" ("The Robbers"), was produced in 1957. He composed two operas based on plays by Ödön von Horváth.