- Albert Spalding, Franz Rupp, Johana Harris, Joseph Kahn, Marian Anderson, Vernon de Tar, Harry Isaacs, William Primrose, Andre Benoist, Jascha Heifetz, Vladimir Sokoloff
- Frankfurt Radio Symphony, Berlin Staatsoper Orchestra, Sebastian Peschko, Gerhard Steeger, Heinrich Schlusnus, Kurt Schröder, Franz Rupp