"its an old Icelandic trad ...from 18 hundred"
http://www.youtube.com/watch?v=9wxzJnqFLWs&context=C3fd21f9ADOEgsToPDskKu-UVkCKNPL3-h1LZTEDGv
I hope skarpi doesn't mind me doing this. I didn't ask for his permission (sue me). You should hear some of the other tunes by skarpi and by the band. Great stuff.