In a 1980 interview with NPR, composer Aaron Copland chuckled when he talked about misconceptions people have about his ballet, "Appalachian Spring.""I was not thinking about the Appalachian Mountains when I wrote it. People are very disappointed to hear me say that." In today's show, the story of how the "Ballet for Martha" became "Appalachian Spring," and a performance by the Knights in Stillwater, Minnesota. Plus, Bruce Adolphe stops by for a new Piano Puzzler.