I saw this on the news last night. Eric Whitacre, a Grammy winner, had the idea to have hundreds of people send him videos of them, an individual, singing a song according to a video of him conducting it. Then, he would combine all the tracks into a single track—a virtual choir. This is what resulted. Be prepared for chills, and you might want to have a tissue nearby for good measure. Oh, that we had more church choirs like this!