"La mer" was the second of Debussy's three orchestral works in three sections. The first, the "Nocturnes", was premiered in Paris in 1901, and though it had not made any great impact with the public it was well reviewed by musicians including Paul Dukas, Alfred Bruneau and Pierre de Bréville. Debussy conceived the idea of a more complex tripartite orchestral piece, and began work in August 1903. He was usually a slow worker, and although the composition of "La mer" took him more than a year and a half, this was unusually quick progress by his standards, particularly at a time of upheaval in his personal life. He began composing the work while visiting his parents-in-law in Burgundy; by the time it was complete, he had left his wife and was living with Emma Bardac, who was pregnant with Debussy's child.