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The Craft of Musical Composition is a three-volume treatise written by Paul Hindemith, a German composer and music theorist. The treatise, published in 1941, 1942, and 1943, covers a wide range of topics, including harmony, counterpoint, form, orchestration, and instrumentation. Hindemith wrote The Craft of Musical Composition as a comprehensive guide to musical composition, and it remains a valuable resource for students and composers today.