Karin Dreijer Andersson and Olof Dreijer, the brother-sister duo behind Swede electro outfit the Knife, are an odd pair: they wear bird masks, rarely give interviews, and sent reps dressed as gorillas to accept their 2003 Grammis (read: Swedish Grammy).

Imagine if Stevie Nicks was raised on the ice planet Hoth by shamans and given unlimited access to lasers, keyboards, tribal costumes, drum and smoke machines, and elongated percussion instruments with feathers attached. Meet Fever Ray, a Swedish outfit that made their U.S. debut at Webster Hall in New York City Monday night.