In 1998 he took over the title role in the world premiere of Farinelli by Siegfried Matthus.
Hübner sang in the world premieres of Siegfried Matthus's Der letzte Schuss (The Last Shot) 1966, Ernst Hermann Meyer's Reiter in der Nacht (Rider in the Night) 1973, and Rainer Kunad's Sabellicus 1974.
Kammeroper Schloss Rheinsberg is an international opera festival for young talented singers, founded and directed by German composer Siegfried Matthus.
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Siegfried Matthus has been the Artistic Director of the Chamber Opera Schloss Rheinsberg since 1990, Claudia Eder is the Voice Advisor and Rainer Schwarz the Festival Manager and Executive Director.
In 2003 he composed music for both a ballet and an opera adaptation of Michael Ende's The Neverending Story.
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2003 Die unendliche Geschichte (after Michael Ende's The Neverending Story commissioned by the Department for Culture of Rhineland-Palatinate, libretto by Anton Perrey)
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On January 25, 2009, Leon Botstein and the American Symphony Orchestra presented the New York premiere performance of Matthus's "Responso," a four-movement symphony written in 1977.
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