Aaron Copland (1900-1990) was an influential American composer, often referred to as the "Dean of American Composers." His music is characterized by a distinctively American style that incorporates elements of folk music, jazz, and classical traditions. Copland's work spans various genres, including orchestral, ballet, opera, and choral music. Notable works include the ballets "Appalachian Spring," "Rodeo," and "Billy the Kid," as well as orchestral pieces like "Fanfare for the Common Man" and "Lincoln Portrait." His compositions often evoke the vast American landscape and reflect themes of democracy and the American spirit. Copland's impact on music extends beyond composition; he was also a prominent advocate for American music and helped to establish a national identity in classical music. His use of open harmonies and rhythmic vitality influenced generations of composers and musicians. Through his educational efforts and writings, he played a significant role in promoting a uniquely American sound in 20th-century music, making him a pivotal figure in both American and global music history.