Conlon Nancarrow wrote piano music that no one could play. The only way he could hear it was to put it on the roll of a player piano; & that's what he did for all his works...Two other maverick 20c composers i like are: Harry Partch, who invented his own musical scale--& the instruments to play it--; & Olivier Messiaen, who turned for inspiration to Eastern music & birdsong, for some of the weirdest (or most sharawadgi) church music ever written. One of his works, "Turangalila", must be the only symphony that uses a theremin (another of my pet obsessions).