Kearns, William K. Horatio Parker (1863-1919): His Life, Music, and Ideas. Metuchen, NJ: The Scarecrow Press, 1990.

Hicks, Michael. Henry Cowell, Bohemian. Urbana, IL: University of Illinois Press, 2002.

Henahan, Donal. “The Polysided Views of Ives’s Polytonality.” The New York Times. June 10, 1990.

Broyles, Michael, and Denise Von Glahn. 1999. “Later Manifestations of Concord: Charles Ives and the Transcendentalist Tradition.” In Transient and Permanent: The Transcendentalist Movement and its Contexts, edited by Charles Capper and Conrad Edick Wright, 574-604. Studies in American History and Culture, No. 5. Boston, MA: Massachusetts Historical Society.

Boziwick, George. “Henry Cowell at the New York Public Library: A Whole World of Music.” Notes 57, no. 1 (September 2000): 46-58.

Bellamann, Henry. Program Notes to Ives's Fourth Symphony. Pro Musica Concert, January 29, 1927.

Beal, Amy. “The Army, the Airwaves, and the Avant-Garde: American Classical Music in Postwar West Germany.” American Music 21, no. 4 (Winter 2003): 474-513.

Ballard, Lincoln. “Charles Ives and Scriabin: An Unanswered Question?” Lecture, Society for American Music National Meeting, Eugene, Oregon, February 17, 2005.

Shirley, Wayne. “Once More through The Unanswered Question.” Institute for Stud-ies in American Music Newsletter 18/2 (May 1989): 8-9, 13.

Porter, David G. “On the Reconstruction of Charles Ives’s ‘Emerson’ Piano Concerto.” Unpublished commentary, 1998.