The major international opera houses she has sung in include the Deutsche Oper Berlin, the Deutsche Oper am Rhein, the Deutsche Staatsoper Berlin, the Nuremberg Opera, the Gulbenkian Auditorium in Lisbon, the Festwochen Herrenhausen in Hannover, the Schloß Sanssouci in Potsdam, the Kallang Theatre and Victoria Theatre in Singapore, the Festspielhaus in Baden Baden, and the Gran Teatre del Liceu in Barcelona.
Her season 2011-2012 was highlighted by Il trionfo del Tempo e del Disinganno at the Staatsoper Berlin under the baton of Marc Minkowski, Alcina (Bradamante) at the Lausanne Opera under the baton of Ottavio Dantone and Rinaldo (title role) in Reggio Emilia and Ferrara.
In 1993 he became principal conductor of the Mecklenburgische Staatsoper Schwerin.
Leo Blech (21 April 1871 – 25 August 1958) was a German opera composer and conductor who is perhaps most famous for his work at the Königliches Schauspielhaus (later the Berlin State Opera (Staatsoper Unter den Linden) from 1906 to 1937, and later as the conductor of Berlin's Städtische Oper from 1949 to 1953.
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In 1926 he returned to the Schauspielhaus, now called the Staatsoper unter den Linden, where he remained until Adolf Hitler's antisemitic policies forced him in 1937 into exile in Riga, where he conducted the Latvian National Opera and Ballet Theatre.
In 1975, she became a member of the Bayerische Staatsoper where she called attention to Wolfgang Wagner who immediately engaged her for Erda in Richard Wagners Ring des Nibelungen at the Bayreuth Festival 1976 Jahrhundertring (Centenary Ring) in 1976, celebrating the centenary of both the festival and the first performance of the complete cycle, conducted by Pierre Boulez and staged by Patrice Chéreau, recorded and filmed in 1979 and 1980.
Brendel has performed on all the major opera stages in Germany (Hamburg State Opera, both the Deutsche Oper and the Staatsoper in Berlin, Dresden) and throughout Europe (Vienna, Milan, London, Paris, Bayreuth, Dresden, Amsterdam, Lisbon, Madrid), in Tokyo, and in the United States (New York, Chicago, San Francisco, Los Angeles, Dallas).