Clément Philibert Léo Delibes (French: [klemɑ̃ filibɛʁ leo dəlib]; 21 February 1836 – 16 January 1891) was a French Romantic composer, best known for his ballets and operas. His works include the ballets Coppélia (1870) and Sylvia (1876) and the opera Lakmé (1883), which includes the well-known "Flower Duet". Born into a musical family, Delibes enrolled at France's foremost music academy, the Conservatoire de Paris, when he was twelve, studying under several professors including Adolphe Adam. After composing light comic opérettes in the 1850s and 1860s, while also serving as a church organist, Delibes achieved public recognition for his music for the ballet La Source in 1866. His later ballets Coppélia and Sylvia were key works in the development of modern ballet, giving the music much greater importance than previously. He composed a small number of mélodies, some of which are still performed frequently. Delibes had several attempts at writing more serious operas, and achieved a considerable critical and commercial success in 1883 with Lakmé. In his later years he joined the faculty of the Conservatoire, teaching composition. He died at his home in Paris at the age of 54. Coppélia and Sylvia remain core works in the international ballet repertoire, and Lakmé is revived from time to time in opera houses.

Le roi s'amuse (French pronunciation: [lə ʁwa samyz]; literally, The King Amuses Himself or The King Has Fun) is a French play in five acts written by Victor Hugo. First performed on 22 November 1832 but banned by the government after one evening, the play was used for Giuseppe Verdi's 1851 opera Rigoletto.

Sylvia, originally Sylvia, ou La nymphe de Diane, is a full-length classical ballet in two or three acts, first choreographed by Louis Mérante to music by Léo Delibes. The ballet's premiere took place on 14 June 1876 at the Palais Garnier, but was largely unnoticed by the critics. The first seven productions were commercially unsuccessful, but the 1952 revival, choreographed by Frederick Ashton, popularized the work. Productions in 1997, 2004, 2005, and 2009 productions were all based on Ashton's choreography.