Strauss's next opera was Elektra (1909), which took his use of dissonance even further, in particular with the Elektra chord. Elektra was also the first opera in which Strauss collaborated with the poet Hugo von Hofmannsthal. The two subsequently worked together on numerous occasions. For his later works with Hofmannsthal, Strauss moderated his harmonic language: he used a more lush, melodic late-Romantic style based on Wagnerian chromatic harmonies that he had used in his tone poems, with much less dissonance, and exhibiting immense virtuosity in orchestral writing and tone color. This resulted in operas such as Der Rosenkavalier (1911) having great public success. Strauss continued to produce operas at regular intervals until 1942. With Hofmannsthal he created Ariadne auf Naxos (1912), Die Frau ohne Schatten (1919), Die ägyptische Helena (1928), and Arabella (1933). For Intermezzo (1924) Strauss provided his own libretto. Die schweigsame Frau (1935), was composed with Stefan Zweig as librettist; Friedenstag (1935–6) and Daphne (1937) both had a libretto by Joseph Gregor and Stefan Zweig; and Die Liebe der Danae (1940) was with Joseph Gregor. Strauss's final opera, Capriccio (1942), had a libretto by Clemens Krauss, although the genesis for it came from Stefan Zweig and Joseph Gregor.