""She just opened her mouth and that sound happened from her,"" Dave Matthews told CMT, about the first time he sang with Emmylou Harris. ""It was so phenomenal to be in the same room with [her voice] because it is just exceptional. It is one of the most unusual pipes that has ever come out, and one of the most beautiful."" Now, Harris and Matthews come together on CMT Crossroads, for an episode taped in New York City.