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