Isabel Bayrakdarian, Zheng Cao, Joyce DiDonato, Susan Graham, Paul Groves, Keith Phares, Frederica von Stade, Dawn Harms, CarlaMaria Rodrigues, Emil Miland & Jake Heggie
Helmut Froschauer, Jörg Dürmüller, Franz Hawlata, Andrea Bonig, Alfred Šramek, Wolfgang Bankl, Hermann Godland, Juliane Banse, Heinz Zednik, Dietrich Henschel, North Rhine Westfalia State Youth Choir, Regina Klepper & Cologne West German Radio Orchestra