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Hector Berlioz (1803–1869) reshaped Romantic music with his bold orchestration and narrative-driven compositions. A French conductor and composer, he expanded instrumental color and created dramatic, storytelling symphonic work that continues to influence orchestral music today. His groundbreaking Treatise on Instrumentation (1843) remains a foundational text for conductors and composers. Berlioz’s career was marked by creative risk, rigorous artistry, and lasting impact on how orchestras are written for and heard.