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

The Polar Music Prize was founded by Stig Anderson, the manager of Swedish pop group ABBA, in 1989.

BBC: Patti Smith and Kronos Quartet accept Polar music prize

Senegalese singer Youssou Ndour and Finnish composer Kaija Saariaho have been named as the recipients of this year's Polar Music Prize.

BBC: Youssou Ndour and Kaija Saariaho win Polar Music Prize

Using ever fancier technologies, the oil business is drilling in deeper waters, more difficult terrain and even in the Arctic (which, as global warming melts the polar ice cap, will perversely become the next great prize in oil).

ECONOMIST: Why the world is not about to run out of oil