What German composer wrote Happy End? 
Happy End (musical): Happy End is a three-act musical comedy by Kurt Weill, Elisabeth Hauptmann, and Bertolt Brecht which first opened in Berlin at the Theater am Schiffbauerdamm on September 2, 1929. Kurt Weill: Kurt Julian Weill (March 2, 1900April 3, 1950) was a German composer, active from the 1920s in his native country, and in his later years in the United States.
Kurt Weill