While I'm working, I often have one of my Pandora stations going and I get to hear music I never would have come across otherwise. One morning Pandora started playing "Mercy Seat" by Anonymous 4. I was stopped dead in my tracks by one of the most beautiful things I have ever heard. "Mercy Seat" is a traditional Sacred Harp song that is very moving by itself (watch this video). Anonymous 4 makes it transcendent.
Here's a sample of Mercy-Seat by Anonymous 4 courtesy of Amazon.com