Perhaps calling Bård Ylvisåker and Vegard Ylvisåker "unknown" is somewhat unfair. They're plenty known in their home country of Norway where they go by "Ylvis" and have their very own talk show on TVNorge.
And as part of the promotion campaign for that show's upcoming season premiere, Ylvis released a music video for a song unassumingly called "The Fox" which went on to set the world of sound on fire.
Don't read another word. Just, uh, just listen to it. Seriously, stop reading. Go listen. Stop. Go.