WESTERN EUROPE NORWAY

Norwegian folk music is closely intertwined with the folk music of its Scandinavian neighbor Denmark as the history of Norway is intertwined with that of Denmark, which is quite intertwined. (You knew Denmark ruled Norway from 1380 until the early 1800s, didn't you?) As in Denmark, the primary instrument in Norway's folk music is the fiddle; in Norway, the most distinctive fiddle is the Hardanger. Some cool Norwegian traditional instruments include the bukkehorn (goat horn), the harpeleik (chorded zither), the langeleik (box dulcimer), the lur (an older, trumpet-like instrument), the seljefløyte (a willow flute) and the aptly named Norwegian harp.    

Norway's folk music generally is either "North Germanic" or “Sami.” North Germanic Norwegian music focuses on two kinds of songs – Kvad (ballads) and Stev (improvised songs). "Sami" music is the music of the Sami people of Northern Scandinavia.   

(The video linked above, a performance by KEiNO, is not folk.)