Giselle is rightly referred to as the epitome of Romanticism in ballet. Its plot is based on the legend of the Wilis — the souls of girls who have died before their weddings could take place. At night, they abandon their graves and force any travellers who have lost their way to dance themselves to death. This legend was recorded by the German poet Heinrich Heine, and the Frenchmen Théophile Gautier and Jules-Henri Vernoy de Saint-Georges transformed it into a ballet libretto. The music was composed by Adolphe Adam and the choreography created by Jean Coralli and Jules Perrot. In the 1880s the ballet was revised for the St Petersburg stage by Marius Petipa. It is in this form that the ballet survives today, enchanting audiences across the globe with the idealised skill through which the tragic story of Giselle is transformed into a choreographic poem about the power of a love that conquers death.