Aaron Copland was an American composer who is widely regarded as one of the most important and influential American classical composers of the 20th century. He wrote many popular works, including the ballets 'RODEO' and 'Billy the Kid', the opera 'The Tender Land', and the film score for 'The Red Pony'. His works often incorporated folk music from the American West, and he was a major figure in the development of American music. His most famous composition is 'Fanfare for the Common Man'. AARON Copland's brother, Nederome Copland, was also a composer.