Few figures in American music loom as large as Aaron Copland. As one of the first wave of literary and musical expatriates in Paris during the 1920s, Copland returned to the United States with the means to assume, for the next half-century, a central role in American music as composer, promoter, and educator. His sheer popularity and iconic status are such that his music has transcended the concert hall and entered the popular consciousness; it both accompanies solemn and joyous celebrations the world over (Fanfare for the Common Man) and punctuated the familiar words "Beef: I...