Maintaining an interest in jazz (officially regarded as treason by the Nazi Party) and staying out of trouble represented strictly minor-league intrigues during the Second World War. Nonetheless, it seems to be consistently worth noting that this artist was one of the few jazzmen of German or Austrian nationality who managed to continue performing during the conflict, despite or perhaps because of his status as a member of the German Army. Born in Vienna, Hans Koller had a diploma in his hand from the city's noted Music Academy at the age of 18, one year after he had undertake...