Rocker Patti Smith and US string group Kronos Quartet have received the 2011 Polar Music Prize.

BBC: Patti Smith and Kronos Quartet accept Polar music prize

Bogie and O'Malley scored the Oscar-nominated documentary "How to Survive a Plague, " which features Superhuman Happiness and the Kronos Quartet.

WSJ: Clap Hands for Superhuman Happiness | By Jim Fusilli

The Kronos Quartet, which is based in San Francisco, incorporates avant-garde rock and music from a variety of sources worldwide.

BBC: Patti Smith and Kronos Quartet accept Polar music prize