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He also appeared with such notable German conductors as Kurt Masur, Kurt Sanderling, Wolfgang Sawallisch, Christoph von Dohnányi, along with Seiji Ozawa of Japan, Charles Dutoit of Switzerland, Gennadi Rozhdestvensky of Russia, and French ones such as Marc Minkowski and Emmanuel Krivine.
A recording of the aria by Edda Moser, accompanied by the Bavarian State Opera under the baton of Wolfgang Sawallisch, is included in a collection of music from Earth on the Voyager 1 spacecraft.
Highlights include engagements with, among others, the Boston Symphony Orchestra and Paavo Berglund, the National Symphony Orchestra Washington and Leonard Slatkin, the Chicago Symphony Orchestra and Manfred Honeck, the Berlin Philharmonic Orchestra and Bernard Haitink, the Philharmonia Orchestra and Wolfgang Sawallisch and the Symphony Orchestra of the Bavarian Radio and Mariss Jansons.
Unger's other Salzburg Festival roles included Monostatos in two different stagings of The Magic Flute (1967, 1968 and 1970, staged by Oscar Fritz Schuh and conducted by Wolfgang Sawallisch; 1974 staged by Strehler and conducted by Karajan, and Valzacchi in Richard Strauss' Der Rosenkavalier (1969, staged by Rudolf Hartmann, designed by Teo Otto, and conducted by Karl Böhm).
He cooperated with many outstanding and renowned conductors, like Bruno Bartoletti, Riccardo Muti, Wolfgang Sawallisch, Peter Schreier, F. Luisi, Ch.
In 1978, there was a production without spoken dialogue in an unauthentic musical arrangement, conducted by Wolfgang Sawallisch, directed by August Everding, stage design by Jürgen Rose in the Cuvilliés Theatre, Munich, and in September 2002 it was performed at Chemnitz Opera.