Is the key to finding millions in buried Nazi treasure hidden in a German musical score? Dutch filmmaker and musician Leon Giesen certainly thinks so. The 51-year-old artist has been attracting attention after overseeing digs in the Bavarian town of Mittenwald in a bid to uncover a rumored stash of gold and diamonds dating back to World War II, Der Spiegel reports. Some treasure hunters, including Giesen, believe the key to the buried treasure lies in an annotated piece of music by Gottfried Federlein called "March Impromptu." The theory was first floated a year ago by Dutch writer Karl Hammer Kaatee, who had come into possession of a copy of the music apparently scribbled on by Adolf Hitler's aide Martin Bormann, the report explains. Kaatee claims that Bormann secretly encoded the whereabouts of a Nazi fortune at the end of World War II.