Cover of Wardruna's beautiful song "Helvegen" that appears in 2 different episodes of the tv-show "Vikings".
Wardruna is a band from Bergen in Norway and they make most of the soundtrack in "Vikings". They sing in norweigan  (and occasionally in Old Norse/Norrønt).

https://www.indabamusic.com/opportunities/hollywood-principle-firework-remix-contest/submissions/9ea19ac0-d2b3-11e6-89e4-0ee95250b769  (click the triangle on my photo to hear the song).