Fossegrimen, or just Grim, Foss is Norwegian for Waterfall, is a water creature
He is a young, handsome man who sits naked under waterfalls, playing the fiddle. He plays the music of nature itself, the sound of the water, the wind in the trees, it all comes from his music.
He is said to teach humans how to play if they secretly brought him a stolen piece of meat.
Torgeir Augundsson (1801-1872), better known as Myllarguten, was a famous fiddle player from Telemark, Norway who was so good it was rumored he had sold his soul in exchange of Fossegrimmen’s skills.