text:  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. Beginning this afternoon at five.