In 1937, Karajan first conducted the Berlin Philharmonic and the Berlin State Opera He was very successful when he conducted "Tristan und Isolde". In 1938 a Berlin music critic called him "Das Wunder Karajan" (The Karajan miracle). He started to make recordings. However, one day in June 1939 he was conducting "Die Meistersinger" at Bayreuth in front of Hitler and his guests the King and Queen of Yugoslavia when he suddenly could not remember the music (he was conducting without the score). The singers stopped and the curtain came down. Hitler was very angry and said that Karajan would never conduct at Bayreuth again. This event may actually have helped his career after World War II. Many people who had worked for the Nazis and for Hitler were not allowed to work.