Beth Nielsen Chapman, Rodney Crowell, and Marcus Hummon performing (with a bluebird projected onto the observatory dome) at Dyer Observatory, Nashville, Saturday, May 22, 2010. David J. Eicher photoOn Saturday, May 22, 2010, I spent another full day immersed in astronomy and history and — this time — music. Rocky Alvey, director of Vanderbilt’s Dyer Observatory, has assembled a periodic set of music shows up on the mountain that brings together several hundred enthusiasts who hear beautiful song...