During his years in this role, he became an advocate of music by composers whose music had been outlawed in Germany during the Third Reich: such as Bartók, Stravinsky and Hindemith.
Under sina år i denna roll, blev han en förespråkare av musik av kompositörer vars musik hade förbjudit i Tyskland under Tredje riket, såsom Bartók, Stravinskij och Hindemith.