Howard Pollack wrote a comprehensive biography of Aaron Copland, which was published in 1999.  Here is a link to the  text .  I've long been a great fan of Copland's music, but never read that much about him.  Interesting to find out he was so actively political in his time.  But, it seems that ultimately Copland was most concerned with capturing America's musical pulse,   Although he came to artistic maturity in Paris, studying with Nadia  Boulanger and informing his music with a European-derived  professionalism, and although he made it his business to keep up with  the latest European trends, Copland infused his music with specific  traits that we think of as inherently American: jazzy rhythms, bold  melodies, folk tunes, widely spaced sonorities, bright colors, collage  structures -- all evoking the bustle of the city and the lonely openness  of the plains. As his Argentine friend and colleague Alberto Ginastera  wrote: ''Copland has created American music in t...