Aaron Copland: The Life and Work of an Uncommon Man - Howard Pollack - Google Books

http://books.google.de/books?id=3DGxuzqyTHAC&pg=PA186&dq=Jerome+Moross+1913&hl=de&sa=X&ei=SEDFUu_AFYLPtQauxYDoAw&ved=0CFcQ6AEwAw

The first time in paperback, this is the best full-length biography of Aaron Copland, his life and his music.