The time was 1941 – the United States was staying out of the war in Europe. At home, the NAB was waging war on ASCAP, creating BMI to wrestle away control of musicians so radio controlled what they were paid. Established musicians refused to sign with BMI. Protest marches were held, unions grew stronger. Only fringe musicians signed with BMI and radio stations agreed to only play BMI licensed songs.
Glenn Miller had a #1 jazz hit during this period. It was a light hearted version of the Volga River Boatman’s song (referenced in the Caspian Sea post). It’s roughly the equivalent if Muzak has a version of Ave Maria