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Paul Hindemith passed away on December 28, 1963, at the age of 68. He was a German-born composer, violist, and teacher who was one of the most important figures in 20th-century music. Hindemith's music is often characterized by its use of dissonance and polytonality, and he is considered to be one of the pioneers of serialism. He was also a prolific writer on music theory and aesthetics.