middle age music is back in style

Árstíðir - a band from Iceland are singing the 13th century Icelandic hymn “Heyr himna smiður” at a train station in Wuppertal, Germany.

I remember my music classes in school when everybody just dully look at the teacher talking about middle age music and yawn into his face counting the minutes in their heads till the class is over.
But now when a group of hot blond guys with the beer bottles in their hands sings something similar in public place it goes viral and little girls want to date those guys and claim they have never ever heard anything more beautiful that this while guys blame themselves not coming up with this idea in order to get chicks attention.