 They say strength lies in numbers, but for musicians in Iceland, one of the world's most sparsely populated countries, that equation works in reverse. Collaboration isn't just helpful, it's a must. Artists work together in ways that I don't think are that usual in that many other countries. I'm Scott Detrow. We hear from Chiasmos, the Icelandic duo, about their new album on All Things Considered from NPR News.