She played under Wilhelm Furtwängler a number of times, and had a great affinity for his approach.
Holocaust play on Wilhelm Furtwängler and his former colleagues in the Theresienstadt concentration camp
Wilhelm II, German Emperor | Wilhelm II | Wilhelm Reich | Gottfried Wilhelm Leibniz | Georg Wilhelm Friedrich Hegel | Wilhelm Keitel | Friedrich Wilhelm Joseph Schelling | Wilhelm Furtwängler | Karl Wilhelm Friedrich Schlegel | Wilhelm Wundt | Wilhelm Sasnal | Wilhelm Kempff | Wilhelm Busch | Wilhelm Westphal | Wilhelm von Knyphausen | Wilhelm von Bode | Wilhelm Steinitz | Wilhelm Schlenk | Wilhelm Heinrich Roscher | Wilhelm Gesenius | Wilhelm Canaris | Prince Wilhelm of Hesse-Philippsthal-Barchfeld | Friedrich Wilhelm Freiherr von Bülow | Franz Wilhelm Junghuhn | Carl Wilhelm Siemens | Wilhelm von Tegetthoff | Wilhelm von Schütz | Wilhelm von Humboldt | Wilhelm Solheim | Wilhelm Schüchter |
Reaching beyond Switzerland from the 1930s, the fame of the orchestra later attracted guest conductors including Bruno Walter, Wilhelm Furtwängler, Ernest Ansermet, Hans Knappertsbusch, Ferenc Fricsay, Rafael Kubelík, Günter Wand, Kurt Sanderling, Horst Stein, Yuri Ahronovitch and Eliahu Inbal.
In 1953, Siepi debuted at the Salzburg Festival with a legendary production of Don Giovanni conducted by Wilhelm Furtwängler, staged by Herbert Graf, and designed by Clemens Holzmeister.
She remained a frequent performer at the Hungarian State Opera House and appeared often as a guest at the Bavarian State Opera, Berlin State Opera, and Semperoper under such conductors as Karl Böhm, Victor de Sabata, Wilhelm Furtwängler, Hans Knappertsbusch, Clemens Krauss, and Josef Krips.
He remained with the orchestra for eight years, playing under Wilhelm Furtwängler and guest conductors including Bruno Walter and Willem Mengelberg.
It has been led by several famous choirmasters, including Wilhelm Furtwangler, John Eliot Gardiner and Charles and Fritz Munch the sons of the founder of the choir.
Inspired by a meeting with Wilhelm Furtwängler in the 1950s, he began a lifelong attachment to the music of Anton Bruckner, recording the complete Bruckner symphonies several times.