Scotty Heron has been sharing his madcap vision with downtown audiences since the mid-Eighties, all the while living and touring all over the country. Appalachian Spring Break, his collaboration with sound designer Brendan Connelly, channels Martha Graham and Aaron Copland's masterwork of a similar name, and returns here after a too-brief run in Brooklyn last winter. I can add nothing to two brilliant observations already made: Minneapolis choreographer Emily Gastineau described the piece as "an apt revision of Graham's imagery — an homage to the American spirit in less confident times, where the structure could crumble at any moment but the climber hasn't lost his nerve." Said Voice critic Helen Shaw, "the two clamber over each other like a pair of puppies figuring out for the first time they have legs. It seems like mayhem, and then beauty asserts itself — classic and anarchic and enlivening at once, the perfect expression of vernal riot."