The choral rock band out of Dallas, Texas, has been thrilling audiences with its live performances for over a decade.
One of the reasons the Taliban has been so difficult to defeat in Afghanistan is its control over the local people. They have earned popularity by delivering a form of local justice.
But there are signs – even in some of the most troubled parts of the country – that the Afghan government and police are making inroads to change that.
The BBC’s David Loyn reports from Helmand Province in Afghanistan.