Leo Ornstein

Leo Ornstein (born Lev Ornshteyn; Russian: Лев Орнштейн; c. December 11, 1895 – February 24, 2002) was an American experimental composer and pianist of the early twentieth century. His performances of works by avant-garde composers and his own innovative and even shocking pieces made him a cause célèbre on both sides of the Atlantic. The bulk of his experimental works were written for piano. Ornstein was the first important composer to make extensive use of the tone cluster.