* American folk music: Copland was born in Brooklyn, New York, and he was exposed to American folk music from an early age. He loved the simplicity and directness of folk songs, and he often used them as the basis for his own compositions.
* Jazz: Copland was also a fan of jazz, and he was particularly influenced by the improvisational nature of jazz. He used jazz elements in many of his compositions, such as his "Piano Concerto" and his "Clarinet Concerto."
* Classical music: Copland studied classical music at the Juilliard School, and he was deeply influenced by the works of composers such as Bach, Beethoven, and Brahms. He admired the craftsmanship and technical skill of these composers, and he tried to incorporate some of their techniques into his own music.
* The American landscape: Copland was also inspired by the American landscape. He loved the vastness and beauty of the American West, and he often wrote music that reflected his experiences there. His "Appalachian Spring" and "Billy the Kid" are two examples of his landscape-inspired compositions.
* His Jewish heritage: Copland was a practicing Jew, and his Jewish heritage played a role in his music. He wrote several pieces of Jewish-themed music, such as his "Three Hebrew Songs" and his "In the Beginning."
Copland's music is a reflection of his many influences. He was a truly American composer, and his music is a celebration of American life and culture.