[5] Gerber, who had already appeared in Nazi Germany in 1935 with an essay on the Aufgaben der Musikwissenschaft im Dritten Reich in the Neue Zeitschrift für Musik,[6] was admitted to the NSDAP on 17 October 1937, retroactively as of 1 May 1937, and received the membership number 5.863.193.
[4] In 1939/40 an anti-Semitic contribution by Gerber appeared in the Zeitschrift für deutsche Geisteswissenschaft under the title "Die Musik der Ostmark", in which he claimed, among other things At the end of the last century, another generation was given the reins, whose spokesmen were no longer people of the Ostmark, but Weltjudentum [de] (International Judaism), whose first main representative, the Czech ghetto Jew Gustav Mahler, ushered in an era of external and internal decay.
[7]Gerber worked closely with Herbert Gerigk, who was able to win him for a music encyclopaedia as part of the planned Hohe Schule der NSDAP.
[8] In the context of his work at the Hauptstelle Musik des Beauftragten des Führers für die Überwachung der gesamten geistigen und weltanschaulichen Schulung und Erziehung der NSDAP (Amt Rosenberg), which was headed by Herbert Gerigk, he was a staff member of Alfred Rosenberg's magazine Musik im Kriege [de].
[9] In 1942, Gerber stayed in Paris from the end of October to the beginning of November as an employee of the Reichsleiter Rosenberg Taskforce[4] "on behalf of the Hohe Schule" of the NSDAP, in order to collect material for an extensive study on the influence of German musicians on French musical culture.