The solo project of The Knife's Karin Dreijer, Fever Ray shares some of the band's icy electronic atmosphere, but takes a slightly more organic-sounding approach. Fever Ray began after the Knife finished their promotional duties for their 2006 album Silent Shout and Dreijer had her second child; she worked on demos and song ideas by herself, then collaborated with producer Christoffer Berg, who had mixed the Knife's music. Word of the project surfaced during the summer of 2008 and the first music, an instrumental version of "If I Had a Heart," appeared on Fever Ray's MySpace page that Fall. Fever Ray's celebrated self titled album was then released in 2009, spawning the four singles "If I Had a Heart," "When I Grow Up," "Triangle Walks" and "Seven."