Non-profit composer's catalog and archives: providing services and support for sheet music distribution, licensing, and administration for independent American concert music composers. The American Composers Alliance mission is to encourage performances in the U.S. and around the world of music by American composers. We do this by making available a large catalog of music representing a broad spectrum of musical expression in the U.S. from 1900 to the present. Support services from ACA are provided for composers writing chamber music, choral music, new music, opera, dramatic and theatrical music, electronic music, and orchestral music.