Hildegard Rütgers 1963. Between 1963 and 1965 she performed at the Salzburg Festival, the part of "Die Vertraute" (Her confidante) in a production of "Elektra" by Richard Strauss, conducted by Herbert von Karajan, alongside Astrid Varnay in the title role, and Martha Mödl, Hildegard Hillebrecht, James King and Eberhard Waechter in leading parts. The production of Mozart's "Die Zauberflöte" at the Salzburg Festival, with Rütgers as the Third Boy, was filmed and released as a made-for-television-movie in 1964. She appeared alongside Walter Kreppel as Sarastro, Roberta Peters as the Queen of the Night, Pilar Lorengar and Waldemar Kmentt as Pamina and Tamino,
Wolfgang Amadeus Mozart and Prague had allegedly rejected it. Mozart arrived on 28 August 1791 and left in the third week of September. The opera received its first performance on 6 September 1791. Unlike the first two visits, Mozart was not the center of attention on his last visit. Rather, his activities were much overshadowed by the ceremonies of the Imperial court. The grief exhibited for Mozart in Prague after his death on 5 December 1791 far exceeded that witnessed in any other European city. Daniel E. Freeman has pointed out that whereas Mozart (one of history's greatest musicians) was laid to rest in Vienna