A story is told that Richard Wagner was walking on a street in Berlin one day and came across an organ-grinder who was grinding out the overture to Tannhäuser. Wagner stopped and said, "As a matter of fact, you are playing it too fast."

The organ-grinder at once recognized Wagner, tipped his hat, and said, "Oh thank you, Herr Wagner! Thank you, Herr Wagner!"

The next day Wagner returned to the same spot and found the organ-grinder grinding out the overture at the correct tempo. Behind him was a big sign: "PUPIL OF RICHARD WAGNER."