Anton Karas asked a stunned Karas if he would compose the music for the film. Karas protested, saying he had never actually written music. As Karas later told the story, the director insisted and invited Karas to England. The Austrian became homesick and asked to be allowed to return. Reed told him he could—as soon as he had written the music. Under this pressure Karas wrote his Harry Lime theme. The film—with the music a contributing factor—was a gigantic success, and Karas' life was changed drastically. As a result, he toured all over the world and performed for many celebrities, among them
Anton Karas many of the British element of the Allied Control Commission for Austria. Robert Baty, the young son of the Director of Education, C.W. Baty, was given the task of showing the director around the city. On the second day they stopped at a "Heuriger", a wine tavern where growers offer their own wines for sale directly, and heard Karas playing the zither in the background. This is described in Karas' L.A. Times/Reuters obituary which states that: Reed, desperately searching for a theme tune ... chanced on the tavern in Vienna's Grinzing wine-growing district. Struck by the simple zither melodies, Reed