Organized the first Festival of Contemporary Music at Yaddo, Saratoga Springs, New York, and the second the following year.
Taught composition at Harvard University while Walter Piston was on leave of absence.
Co-founded the American Composers Alliance.
Co-founded Arrow Music Press, which incorporated the former Cos Cob Press; served as its treasurer until 1972.
October 16: First performance of his first ballet, Billy the Kid, written for Lincoln Kirstein and the Ballet Caravan.
Published his first book, What to Listen for in Music, based on lectures he had given at the New School for Social Research.
October 13: Elected president of the American Composers Alliance. Resigned as president in 1945 to continue his membership in ASCAP.
At the request of the conductor Serge Koussevitzky, taught composition during the first season of the Berkshire Music Center at Tanglewood, Massachusetts; when Tanglewood reopened after the war (1946), Copland assumed many administrative positions in addition to teaching until his retirement in 1965.
Published the book Our New Music, based on lectures he had given at the New School for Social Research.
Toured Latin America to lecture, perform, and conduct on a grant made possible by the Committee for Inter-American Artistic and Intellectual Relations.
Completed Lincoln Portrait, commissioned by Andre Kostelanetz, with text created by Copland from speeches and letters of Abraham Lincoln.
Composed the ballet Rodeo, commissioned by Agnes de Mille.
Completed Fanfare for the Common Man, which he wrote at the request of Eugene Goossens; Goossens conducted the premiere with the Cincinnati Symphony Orchestra in 1943.
May 8: Elected a member in the Department of Music of the National Institute of Arts and Letters.