Cowell, Henry - compositions Cowell, Henry. Ostinato Pianissimo. New York: New Music Edition, 1953. Cowell, Henry. Symphony No. 11. New York: Associated Music Publishers, 1955. Cowell, Henry. Toccanta. New York: Boosey and Hawkes, 1960. Cowell, Henry. 26 Simultaneous Mosaics. New York: C.F. Peters, 1963. 10/19/88