httpv://www.youtube.com/watch?v=5bpcDe7mEXM
From the video author:
My new keyed fiddle (“Schlüsselfiedel” in German, “nyckelharpa” in Swedish). This instrument was common throughout the German speaking areas until the 17th century – from then on, it was kept only in the area of Uppland in Sweden, where the art of the instrument was rediscovered in the 20th century.