- New Friends of Music Orchestra, John Wummer, Otto Klemperer, Rudolf Kolisch, Amsterdam Strings, John Meisner, Edith Weiss Mann, Dorothy Chester
- John Mack, Gilbert Coursier, Leila Storch, Pau Casals, John Wummer, Prades Festival Orchestra, Paul Tortelier, Marcel Mule, Lucien Thevet, Isaac Stern, Alexander Schneider, Marcel Tabuteau, Maurice Allard, Fernando Valenti
