Earle Brown

Earle Brown was an American music composer, producer, and educator who, as a composer, was a close associate of John Cage, and established his own formal and notational systems. As such, he created "open form," a style of musical construction that influenced composers like John Zorn and the downtown New York scene of the 1980s, as well as later generations of composers.

— Source: Wikipedia (CC-BY-SA).