Harpens kraft (Danish) or Harpans kraft, meaning "The Power of the Harp", is the title of a supernatural ballad type, attested in Danish, Swedish, Norwegian, and Icelandic variants. In The Types of the Scandinavian Medieval Ballad it is catalogued type A 50, "Man saves his bride from merman by playing his harp". The ballad of this type occur under the following titles. Danish: "Harpens kraft" (DgF 40); Swedish: "Harpans kraft" (SMB 22); Norwegian: Villemann og Magnhild ( 26); Gaute og Magnild and Guðmund og Signelita (Landstad 51 and 52), etc.; and Icelandic: Gautakvæði "Gauti's ballad" ( 3).