Christiane Karg Festival in 2006, as Melia in Mozart's "Apollo et Hyacinthus" and as Weltgeist in his "Die Schuldigkeit des ersten Gebots". A year later she appeared there as Madame Silberklang in his "Der Schauspieldirektor" and in a title role of his "Bastien und Bastienne". From the 2008/09 season, Karg was a member of the Frankfurt Opera where she appeared as Susanna in Mozart's "Le nozze di Figaro", as Pamina in his "Die Zauberflöte", as Musetta in Puccini's "La bohème", Zdenka in "Arabella" by Richard Strauss, and the title role in Debussy's "Pelléas et Mélisande". She appeared as Sophie in "Der Rosenkavalier"
Moses und Aron about the number 13; "Moses und Aaron" has 13 letters. Zoltán Kocsis (Hungarian conductor, composer and pianist) had received permission from Schoenberg's heirs in 2009 to complete the last act. His version was premiered in concert at Budapest on 16 January 2010. As Schoenberg always intended to finish the work, the opera was not performed during his lifetime. However, the first public performance of music from the opera was of "Der Tanz um das goldene Kalb" in concert at Darmstadt on 2 July 1951, just 11 days before the composer's death. There was a concert performance of the two acts