Roland Büchner, Bulgarian National Choir, Vincente Ombuena Valls, Michael-Christfried Winkler, Basso, Il, Todor Grigorov, Staatskapelle Berlin, Boris Christoff, Hubert Velten, Franco de Grandis, Bratislava Philharmonic Chorus, Russian National Orchestra, Frankfurt Vocal Ensemble, Rundfunkchor Berlin, RIAS Symphony Orchestra, Olga Romanko, Michael Knapp, Dresdner Kreuzchor, Emil Tabakov, David Cordier, Ralf Otto, Marcus Creed, Das Kleine Konzert, Cappella Coloniensis, Berliner Singakademie, Gabriele Ferro, Celina Lindsley, Martin Flaemig, Rudolf Barshai, Ildikó Raimondi, Georgi Robev, MDR Rundfunkchor, Ernst Jankowitsch, Ursula Fiedler, Sofia Orthodox Ensemble, Sveshnikov Boys and Men's Choir, Jörg-Peter Weigle, Helmut Wildhaber, Jakob Stampfli, Stefania Toczyska, Bernarda Fink, Martin Haselböck, Cologne Radio Chorus, Helmuth Froschauer, Nicola Ghiuselev, Rheinische Kantorei, Regensburg Cathedral Choir, Herbert Lippert, Werner Hollweg, Stuttgart Philharmonic Orchestra, János Ferencsik, Uwe Gronostay, Sofia Philharmonic Orchestra, RIAS Kammerchor, Hugo Distler Chor, Moscow Rybin Choir, Barbara Hölzl, WDR Symphony Orchestra Cologne, Vienna Academy, Vienna Boys' Choir, Peter Marschik, Hermann Max, CantArte Regensburg, Bratislava Philharmonic Orchestra, Miroslav Popsavov, Dietrich Knothe