La Sylphide (The Sylph) is one of the world's oldest surviving romantic ballets. There were two versions of the ballet; the version choreographed by the Danish balletmaster August Bournonville (1805-1879) is the only version known to have survived.
On March 12, 1832, the first version of La Sylphide premiered at the Salle Le Peletier of the Paris Opéra with choreography by Filippo Taglioni and music by Jean-Madeleine Schneitzhoeffer. Taglioni designed the work as a showcase for his daughter Marie. The ballet's libretto was written by tenor Adolphe Nourrit, the first Robert in Meyerbeer's Robert Le Diable, an opera which introduced the dancer Marie Taglioni in its dances section The ballet of nuns. Nourrit's scenario was loosely based on a story by Charles Nodier, Trilby, ou Le lutin d'Argail, but swapped the genders of the protagonists — a goblin and a fisherman's wife in Nodier; a sprite and a farmer in the ballet.
In 1836, La Sylphide was choreographed anew by the Danish balletmaster August Bournonville with music by Herman Severin Løvenskiold. Bournonville had intended to present a revival of Taglioni's original version in Copenhagen with the Royal Danish Ballet, but the Paris Opera demanded too high a price for Schneitzhoeffer's score. In the end, Bournonville mounted his own production based on the original libretto. The premiere took place on November 28, 1836. The Bournonville version has been danced in its original form by the Royal Danish Ballet ever since its creation and remains one of Bournonville's most celebrated works. Modern interpreters of Bournonville's version include Eva Evdokimova and Lis Jeppesen, whose performance is recorded on DVD.
In 1892, Marius Petipa mounted a revival of Taglioni's original La Sylphide for the Imperial Ballet, with additional music by Riccardo Drigo. A variation Drigo composed for the ballerina Varvara Nikitina in Petipa's version is today the traditional solo danced by the lead ballerina of the famous Paquita Grand Pas Classique, interpolated by Anna Pavlova in 1904.
In 1972, a revival of the Taglioni version was staged by Pierre Lacotte for the Paris Opera Ballet. Since Taglioni's choreography has been irretrievably lost, Lacotte's choreography is based on prints, notes, drawings, and archival materials from the era of the ballet's premiere. Lacotte's choreography is in the style of the period but entirely new and has been criticised by some as inauthentic. Interpreters of the role of Lacotte's version at the Opera National de Paris include Ghislaine Thesmar (Lacotte's wife) and Aurelie Dupont. Both artists have recorded their work on DVD and video.
La Sylphide is often confused with Les Sylphides, another ballet involving the mythical sylph, or forest sprite. The latter was choreographed by Michel Fokine for the Ballets Russes as a short performance. Though inspired by La Sylphide, it was meant to be performed as an independent ballet with its own merits.
Act 1 
In the hall of a Scottish farmhouse, James Ruben, a young Scotsman, sleeps in a chair by the fireside. A sylph, or forest fairy, gazes lovingly upon him and dances about his chair. She kisses him and then vanishes when he suddenly wakes. James rouses his friend Gurn from sleep, and questions him about the sylph. Gurn denies having seen such a creature and reminds James that he is shortly to be married. James dismisses the incident and promises to forget it.
James' bride-to-be, Effie, arrives with her mother and bridesmaids. James dutifully kisses her, but is startled by a shadow in the corner. Thinking his sylph has returned, he rushes over, only to find the witch, Old Madge, kneeling at the hearth to warm herself. James is furious with the disappointment.
Effie and her friends beg Old Madge to tell their fortunes, and the witch complies. She gleefully informs Effie that James loves someone else and she will be united with Gurn. James is furious. He forces Madge from the hearth and throws her out of the house. Effie is delighted that James would tangle with a witch for her sake.
Effie and her bridesmaids hurry upstairs to prepare for the wedding, and James is left alone in the room. As he stares out the window, the sylph materializes before him and confesses her love. She weeps at his apparent indifference. James resists at first, but, captivated by her ethereal beauty, capitulates and kisses her tenderly. Gurn, who spies the moment from the shadows, scampers off to tell Effie what has happened.
When the distressed Effie and her friends enter after hearing Gurn's report, the sylph disappears. The guests assume Gurn is simply jealous and laugh at him. Everyone dances. The sylph enters during the midst of the revelry and attempts to distract James.
As the bridal procession forms, James stands apart and gazes upon the ring he is to place on Effie's finger. The Sylph snatches the ring, places it on her own finger, and, smiling enticingly, rushes into the forest. James hurries after her in ardent pursuit. The guests are bewildered with James' sudden departure. Effie is heartbroken. She falls into her mother's arms sobbing inconsolably.
Act 2 
In a fog shrouded part of the forest, Madge and her companion witches dance grotesquely about a cauldron. The revellers add all sorts of filthy ingredients to the brew. When the contents glow, Madge reaches into the cauldron and pulls a diaphanous, magic scarf from its depths. The cauldron then sinks, the witches scatter, the fog lifts, and a lovely glade is revealed.
James enters with the sylph who shows him her charming, woodland realm. She brings him berries and water for refreshment but avoids his embrace. To cheer him, she summons her ethereal sisters who shyly enter and perform their airy dances. The young Scotsman is delighted and joins the divertissement before all flee for another part of the forest.
Meanwhile, the wedding guests have been searching the woodland for James. They enter the glade. Gurn finds his hat, but Madge convinces him to say nothing. Effie enters, weary with wandering about the forest. Madge urges Gurn to propose. He does and Effie accepts his proposal.
When they all have left, James enters the glade. Madge meets him, and tosses him the magic scarf. She tells the young farmer the scarf will bind the sylph to him so she cannot fly away. She instructs him to wind the scarf about the sylph's shoulders and arms for full effect. James is ecstatic. When the sylph returns and sees the scarf, she allows James to place it around her trembling form.
As James embraces the sylph passionately, her wings fall off, she shudders, and dies in James' arms. Sorrowfully, her sisters enter and lift her lifeless form. Suddenly, a joyful wedding procession led by Effie and Gurn crosses the glade. James is stunned. Madge directs his gaze heavenward; he sees the sylph borne aloft by her sisters. James collapses. Madge exults over his lifeless body. Evil has triumphed.
- James Ruben, a Scottish farmer
- The Sylph, a forest spirit
- Gurn, James' friend
- Effie, James' fiancee
- Old Madge, a village sorceress
- Effie's mother, an elderly woman
- Bridesmaids, wedding guests, witches, sylphs
See also 
- "Sylfiden findes" - webpage for book on this ballet (In Danish, with summary in English a.o. languages)