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Louis-Hector Berlioz was a French Romantic composer, best known for his compositions Symphonie fantastique, Harold en Italie, Roméo et Juliette, Grande messe des morts (Requiem), L'Enfance du Christ, Benvenuto Cellini, La Damnation de Faust, and Les Troyens. Berlioz made significant contributions to the modern orchestra with his Treatise on Instrumentation. He specified huge orchestral forces for some of his works, and conducted several concerts with more than 1,000 musicians. He also composed around 50 compositions for voice, accompanied by piano or orchestra. His influence was critical for the further development of Romanticism, especially in composers such as Richard Wagner, Nikolai Rimsky-Korsakov, Franz Liszt, Richard Strauss, and Gustav Mahler.