Henry Dixon Cowell (1897–1965) was an American composer, music theorist, and pianist known for his innovative contributions to 20th-century music. He is associated primarily with the avant-garde and experimental genres, often incorporating elements of folk music and non-Western traditions into his works. Cowell was a pioneer of extended piano techniques, utilizing methods such as strumming the strings and playing directly on the piano's body. Notable works include "The Banshee" (1925), which uses the piano's strings, and "Aeolian Harp" (1923), showcasing his unique approach to sound. His "Concerto for Piano and Orchestra" (1933) and "Symphony for Strings" (1935) also exemplify his innovative style. Cowell was a significant figure in the development of American music and played a vital role in promoting contemporary composers through his influential publications and performances. He was a mentor to many prominent composers, including John Cage and Lou Harrison, thus shaping the direction of modern music. His advocacy for multicultural influences in music and his experimental techniques have left a lasting impact, establishing him as a key figure in the evolution of 20th-century composition.