La mer (The Sea), is an orchestral composition by the French composer Claude Debussy. The work was started in 1903 in France and completed in 1905 at Grand Hotel, Eastbourne on the English Channel coast. The premiere was given on 15 October 1905 in Paris, by the Orchestre Lamoureux under the direction of Camille Chevillard. It became one of Debussy's most admired and frequently performed orchestral works.

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