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How does the Norwegian Hardanger fiddle differ from an ordinary fiddle?

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rooster weather vane — Folk art Rooster weather vane, sheet and wrought iron, American, 19th century; in the Smithsonian American Art Museum, Washington, D.C. 73.6 × 166.4 × 4.5 cm.

The Norwegian Hardanger fiddle differs from an ordinary concert violin primarily in its construction and the resulting sound quality. While it is held and played in the same manner as a standard fiddle, it is slightly smaller in size.1

The most significant technical distinction is the inclusion of four or five metal sympathetic strings positioned beneath the four primary bowed strings. These sympathetic strings are not played directly; instead, they vibrate in response to the bowed strings, reinforcing the upper harmonics and producing a characteristic "bright, silvery" sound. This use of sympathetic resonance is a fundamental feature of the instrument, distinguishing it from the standard violin, which relies solely on its four bowed strings for sound production.123

The Hardanger fiddle is a regional instrument of western Norway that emerged in the late 17th century and is specifically used to perform rhythmically complex polyphonic music for traditional social dances.1