Harry Gilbert (Gil) Trythall (born October 28, 1930) is an American composer and pianist of contemporary classical music. As a musician, Trythall is best known for his experiments and compositions in electronic music. In 1948, he enrolled at the University of Tennessee where he studied under David Van Vactor graduating with a Bachelor of Arts in 1951. He was then admitted, that same year, to Northwestern University where he studied under Wallingford Riegger obtaining a Master of Music in 1952.
Trythall served in the United States Air Force from 1953 to 1957. He then completed his music studies attending, from 1957 to 1960, advanced composition courses at Cornell University where he studied under Robert Moffat Palmer obtaining a Doctor of Musical Arts degree.