It's been about 75 years since Martha Graham and Aaron Copland joined forces to create "Appalachian Spring," an instant hit about life on the American frontier. Mr. Connelly and Mr. Heron, a contemporary composer-choreographer duo, offer a more chaotic collaboration - and possibly a more dystopian view of America - with "Appalachian Spring Break," a noisy evening-length work involving sound-generating objects and references to the Ken Burns mini-series "The Civil War."