The American Composers Orchestra (ACO) is a prominent ensemble based in New York City, dedicated to showcasing the works of contemporary American composers. Founded in 1977, the ACO aims to promote new music and provide a platform for emerging and established composers to present their creations. The orchestra performs a variety of concerts, including premieres and commissioned works, often collaborating with other artists and organizations. Through initiatives like the Orchestra's Composers Institute, the ACO supports the development of new compositions and fosters innovation in orchestral music, enriching the cultural landscape of the United States.