Die ägyptische Helena (1927), and Arabella (1932), all in collaboration with Hofmannsthal; and Die schweigsame Frau (1934), with Stefan Zweig as librettist; Friedenstag (1936) and Daphne (1937) (libretto by Joseph Gregor and Zweig); Die Liebe der Danae (1940) (with Gregor) and Capriccio (libretto by Clemens Krauss ) ( 1941 ). Strauss