Question: what opera was Aatos Abel Tapala in that was originally wrote by Hugo von Hofmannsthal? 
Context: Der Rosenkavalier is a 1926 Austrian silent film of the opera of the same name by Richard Strauss (music) and Hugo von Hofmannsthal (libretto).  Directed by Robert Wiene, it premiered on 10 January 1926 at the Dresden Semperoper, which had also hosted the actual opera's premiere 15 years earlier.  Hofmannsthal considerably changed the storyline for the film version (which included a final scene in the formal gardens behind the Field Marshal's residence) and Strauss' score included music not only from the opera but also sections of his Couperin Suite and a march for the Field Marshal, who appears in this version. Café Griensteidl was a traditional Viennese café located at Michaelerplatz 2 across from St. Michael's Gate at the Hofburg Palace in the Innere Stadt first district of Vienna, Austria.  The cafe was founded in 1847 by former pharmacist Heinrich Griensteidl.  In January 1897, the original building was demolished during the course of the renovation of Michaelerplatz.  In 1990, the café was reopened and became a popular location among the Viennese coffeehouse culture.  During the early twentieth century, the café was frequented by many artists, musicians, and writers, including Hugo von Hofmannsthal, Arthur Schnitzler, Arnold Schoenberg, Alexander Zemlinsky, Hermann Bahr, Friedrich Eckstein, Rudolf Steiner, Hugo Wolf, and Stefan Zweig. Die ägyptische Helena ("The Egyptian Helen"), Op. 75, is an opera in two acts by Richard Strauss to a German libretto by Hugo von Hofmannsthal.  It premiered at the Dresden Semperoper on 6 June 1928.  Strauss had written the title role with Maria Jeritza in mind but, creating quite a sensation at the time, the Dresden opera management refused to pay Jeritza's large fee and cast Elisabeth Rethberg instead as Helen of Troy.  Jeritza eventually created the part in Vienna and New York City. Elektra, Op.  58, is a one-act opera by Richard Strauss, to a German-language libretto by Hugo von Hofmannsthal, which he adapted from his 1903 drama "Elektra".  The opera was the first of many collaborations between Strauss and Hofmannsthal.  It was first performed at the Dresden State Opera on 25 January 1909.  It was dedicated to his friends Natalie and Willy Levin. Die Frau ohne Schatten (The Woman without a Shadow), Op. 65, is an opera in three acts by Richard Strauss with a libretto by his long-time collaborator, the poet Hugo von Hofmannsthal.  It was written between 1911 and either 1915 or 1917.  When it premiered in Vienna on 10 October 1919, critics and audiences were unenthusiastic.  Many cited problems with Hofmannsthal's complicated and heavily symbolic libretto.  However, it is now a standard part of the operatic repertoire. This is a list of recordings of "Elektra", a one-act opera by Richard Strauss with a German-language libretto by Hugo von Hofmannsthal.  The work was first performed at the Dresden State Opera on 25 January 1909. Aatos Abel Tapala (born May 5, 1940, Sauvo) is a Finnish actor, opera singer and, for a time, a soloist for the Finnish National Opera from 1965-1972.  Throughout the course of his lifetime Tapala has participated in various roles in operas and musicals such as "Tamino" in "Taikahuilu", "Basilio" in "Figaron häät", "Perämies" in "Lentävä hollantilainen", "Aegisthus" in "Elektra", "Maalari" in Lulu, "Šemeikka" in "Juha" and "Tony" in "West Side Story". Die Liebe der Danae ("The Love of Danae") is an opera in three acts by Richard Strauss to a February 1937 German libretto by Joseph Gregor, based on an outline written in 1920, "Danae, or The Marriage of Convenience", by Hugo von Hofmannsthal.  Strauss worked on the score in 1937, 1938 and into 1939, although he was pre-occupied with completing "Daphne", developing ideas with Gregor and finally replacing him as librettist for "Capriccio", and then succumbed to illness, which caused postponement for several months into 1940.  The opera was finally finished on 28 June 1940. Der Rosenkavalier (The Knight of the Rose or The Rose-Bearer), Op. 59, is a comic opera in three acts by Richard Strauss to an original German libretto by Hugo von Hofmannsthal.  It is loosely adapted from the novel "Les amours du chevalier de Faublas" by Louvet de Couvrai and Molière’s comedy "Monsieur de Pourceaugnac".  It was first performed at the Königliches Opernhaus in Dresden on 26 January 1911 under the direction of Max Reinhardt, Ernst von Schuch conducting.  Until the premiere the working title was "Ochs von Lerchenau".  (The choice of the name Ochs is not accidental, for in German Ochs means ox, which depicts the character of the Baron throughout the opera.) Ariadne auf Naxos ("Ariadne on Naxos"), Op.  60, is an opera by Richard Strauss with a German libretto by Hugo von Hofmannsthal.  Combining slapstick comedy and consummately beautiful music, the opera's theme is the competition between high and low art for the public's attention.
Answer: Elektra