During the 1990s more and more musicologists, mainly German and British, began examining Pfitzner's life and work. Biographer Hans Peter Vogel wrote that Pfitzner was the only composer of the Nazi era who attempted to come to grips with National Socialism both intellectually and spiritually after 1945. In 2001, Sabine Busch examined the ideological tug-of-war of the composer's involvement with the National Socialists, based in part on previously unavailable material. She concluded that, although the composer was not exclusively pro-Nazi nor purely the antisemitic chauvinist often associated with his image, he engaged with Nazi powers who he thought would promote his music and became embittered when the Nazis found the "elitist old master's often morose music" to be "little propaganda-worthy." The most comprehensive English-language account of Pfitzner's relations with the Nazis is by Michael Kater.