An American tourist visiting the Austrian capital, Vienna, was walking through a graveyard when he suddenly started hearing music. He finally located the source and discovered that it was coming from the grave of Ludwig van Beethoven. Then he realized that the music he was hearing was the Ninth Symphony and that it was being played backwards. Mystified, he left the graveyard but later persuaded a friend to return with him. By the time the pair had returned to Beethoven's grave, the music had cha…