Greg Ross of Futility Closet wrote about composer Conlon Nancarrow, who wrote piano music unplayable by humans.
Born in Texarkana in 1912, Conlon Nancarrow had no access to technology that could realize the music in his head. He studied music briefly and played trumpet in venues ranging from beer halls to cruise ships, but he found himself frustrated working with human musicians. In 1940 he withdrew to Mexico City, where, working in almost complete isolation, he began composing pieces for player piano.
This expedient was “a tremendous amount of work, punching all those holes by hand, one by one, hundreds and thousands of them,” but it enabled him finally to hear his music. “I’d never heard it played. Some composers are pianists and can at least play their music on piano, but I couldn’t do even that, because I am not a pianist.”