Karin Elisabeth Dreijer Andersson (born 7 April 1975), also known by her stage name Fever Ray, is the lead vocalist of the electronic music duo The Knife, formed with her brother Olof Dreijer. Andersson was previously the vocalist and guitarist of the alternative rock band Honey Is Cool. Andersson released her debut solo album under the name Fever Ray in 2009. Her vocal style is notable for both shrill and deep tones, and also the use of multitracked vocals, with different uses of pitch-shifting technology on each track, creating an intricate and mysterious effect.[citation needed] Visually, Andersson employs the use of masks, face and body paint, intricate costumes, and other theatrical elements in photo shoots, videos and live performances, during which she often performs behind a gauze screen that partially obscures her from view.