(GREAT BARRINGTON, Mass.) – Acclaimed singer-songwriters Mary Chapin Carpenter and Marc Cohn will share the Mahaiwe stage for a double-bill concert on Thursday, July 25, 2013, at 8pm, and husband-and-wife duo John Pizzarelli and Jessica Molaskey will share the stage with Pizzarelli’s guitar-playing father, Bucky Pizzarelli, on Saturday, December 28, 2013, at 8pm. Mary Chapin…