Aaron Copland was an American composer who is best known for his works in the 20th century. He was a prolific composer whose music was often inspired by folk traditions and American landscapes. Some of the synonyms for Aaron Copland could include "patriotic music," "American classical music," or "folk-inspired compositions." Another possible synonym for Aaron Copland might be "composer of the great American sound" since his music is often identified with the American sound. Additionally, Copland is often described as a "pioneer in American music" due to his groundbreaking contributions to the field. Overall, Aaron Copland's legacy in American music is one of innovation, inspiration, and distinct national identity.