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 type tells of a hero whose betrothed has premonitions of a fall from a bridge into the river, which despite the hero's assurances and precautions comes true. But by the power of his harp-playing, he regains his bride from the river creature, which is referred to as a "merman" in the TSB catalog:[1] while "merman" (havmand) occurs in a variant, it is called a troll in the older Danish text, and a "neck (nix)" in the Swedish text.
The ballad of this type occur under the following titles. Danish: "Harpens kraft" (DgF 40); Swedish: "Harpans kraft" (SMB 22); Norwegian: Villemann og Magnhild (NMB 26); Gaute og Magnild and Guðmund og Signelita (Landstad 51 and 52), etc.; and Icelandic: Gautakvæði "Gauti's ballad" (IFkv 3).[a]
Noted for its resemblance to the Greek myth of Orpheus, a harp-player with mystical powers, it may be related to medieval versions of that story such as the Middle English Sir Orfeo.[2][3][4]
Similarity has also been noted with the supernatural power of the harp in the Scottish ballad Glasgerion (Child ballad 67 variants B, C, "He'd harpit a fish out o saut water", etc.).[5][6]
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