Jesper Bøje Christensen

Athestis Chorus

Helmut Müller-Brühl

Tsuyoshi Tsutsumi

Charles Rosen

Ede Inhoff

Thomanerchor

The Czech Philharmonic Chamber Orchestra

Hungarian State Opera Orchestra

Dimitri Mitropoulos

Louis Auriacombe

Eduard Melkus

Vyatcheslav Kagan-Paley

Rosa Dominguez

Georges Ivanovitch Gurdjieff

Enrico Gatti

Edward Carroll

Takako Nishizaki

Columbia Symphony Orchestra

The Ambrosian Opera Chorus

Tölzer Knabenchor

Siegfried Lorenz

Yoshikazu Mera

Felicity Palmer

Jerzy Maksymiuk