This is no ordinary choir! The 16-member a cappella choir has been thrilling audiences near and far over the past 18 years with their intricate harmonies, creative arrangements, and quick-stepping choreography. They have performed all over the world and have appeared on such programs as "Good Morning America," Bill Gaither's "Familyfest" and "Praise Gathering," but the group's reputation really grew as a result of its participation on NBC's "The Sing-Off" in 2009, competing against other a cappella vocal groups from across the country.