[4] He conducted there in 1958 the first staged performance of Hans Werner Henze's ballet Das Vokaltuch der Kammersängerin Rosa Silber,[7] with choreography by Lisa Kretschmar [de].
[4][10] The soprano Inge Borkh recalled that Köhler was called to the Staatsoper Stuttgart to step in to prepare Richard Strauss' Die Frau ohne Schatten in 1970 because he had an understanding of the singers' breathing techniques.
[12] He presented an unusual repertoire, including Auber's Die Stumme von Portici[13] and Wagner's Rienzi (with Jon Buzea in the title role, Eike Wilm Schulte as Steffano Colonna and Gail Gilmore as Adriano).
Köhler conducted a performance during the Internationale of 1979 which was recorded live, with Gerd Brenneis as Rienzi, Jeannine Altmeyer as Irene and Glenys Linos [de] as Adriano.
[15][16] In Stockholm, he conducted Mozart's Die Entführung aus dem Serail, Le nozze di Figaro and Don Giovanni, Offenbach's Les Contes d'Hoffman, Franz von Suppé's Boccaccio, Verdi's Simon Boccanegra, Wagner's Der fliegende Holländer, Lohengrin, Der Ring des Nibelungen and Parsifal, Puccini's Madama Butterfly, Elektra and Arabella by Richard Strauss.
A ballet performance used as music Rimskij-Korsakov's Scheherazade, Bizet's Symphony in C, Arvo Pärt's Cantus in Memoriam Benjamin Britten and Four Last Songs by Richard Strauss.
[17] He recorded in 1993 Der tapfere Soldat by Oscar Straus with the WDR Sinfonieorchester Köln and principal singers Johannes Martin Kränzle as Bumeru, Caroline Stein as Nadina Popff, and John Dickie as Alexius Spiridoff.