Sylvia, originally Sylvia, ou La nymphe de Diane, is a full-length ballet in two or three acts, first choreographed by Louis Mérante to music by Léo Delibes in 1876. Sylvia is a typical classical ballet in many respects, yet it has many interesting features that make it unique. Sylvia is notable for its mythological Arcadian setting, creative choreographies, expansive sets and, above all, its remarkable score.
The ballet's origins are in Tasso's 1573 play Aminta, which provides the basic plot of Delibes' work. Jules Barbier and Baron de Reinach adapted this for the Paris Opera. The piano arrangement was composed in 1876 and the orchestral suite was done in 1880.
When Sylvia premiered on Wednesday, June 14, 1876, at the Palais Garnier, it went largely unnoticed. In fact, the first seven productions of Sylvia were not commercially successful. It was the 1952 revival, choreographed by Sir Frederick Ashton, that popularized the ballet. Ashton's success set the stage for the 1997, 2004, 2005 and 2009 productions, all of which were based on his 1952 choreography.
In 1875 the Paris Opera chose Barbier and Reinach's libretto for Sylvia. Mérante was also chosen to choreograph Sylvia based primarily on his extensive experience in the field and position as the premier maître de ballet at Paris Opera. All other reasonable choreographers were at the time unavailable.
Rehearsals for Sylvia begin on August 15, 1875, with only the first third of the music intact. Throughout the rehearsal period the score was under constant revision by Delibes, often with the "aid" of Mérante and Rita Sangalli who would each dance a lead rôle. This development of the score was a grueling process of many revisions and restarts. Mérante was especially demanding of Delibes and would regularly request changes to the score to accommodate his choreography, yet Léo Delibes made the changes requested of him in a timely fashion.