The "Marsch Impromptu" is a 19th-century musical score, attributed to composers such as Josef Löw or Gottfried Federlein, that allegedly contains a secret map to a lost Nazi fortune. Adolf Hitler's personal secretary, Martin Bormann, is said to have added handwritten annotations and runes to the sheet music to reveal the coordinates for 100 gold bars and Hitler’s personal diamonds, nicknamed the "Tears of the Wolf". Treasure hunters like Leon Giesen and Cyril Whistler believe these musical clues point to the Bavarian town of Mittenwald, specifically referencing local landmarks like the luthier Matthias Klotz and the town's railway tracks.