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Hector Berlioz (French: [ɛktɔʁ bɛʁljoːz]; 11 December 1803 – 8 March 1869) was a French Romantic composer, best known for his compositions Symphonie fantastique and Grande messe des morts (Requiem). Berlioz made significant contributions to the modern orchestra with his Treatise on Instrumentation.Name: Berlioz, HectorShort description: French composerDate of birth: 11 December 1803Date of death: 8 March 1869