Already the programme of the publication series Deutsche Musikbücherei showed a strictly anti-modernist, German-national orientation.
In 1939 he was appointed honorary senator of the University of Cologne because of his merits for the Anton Bruckner movement.
On 19 March 1938 Bosse gave the following autobiographical information in response to the questionnaire from the Reichsschrifttumskammer [de]: After the war I was often active in the national struggles for a new Germany.
In this difficult situation the Fuhrer himself intervened at that time by providing assistance through Rudolf Hess and through an envoy of Hitler's Chancellery, Mr. Stark (RM 28,000).
[1]In the winter of 1938/39 Bosse tried to participate in the aryanization of the music publisher C. F. Peters Leipzig.