The Ride of the Valkyries (German: Walkürenritt), is the popular term for the beginning of Act III of Die Walküre by Richard Wagner. The main theme of the ride, the leitmotif labelled Walkürenritt was first written down by the composer on 23 July 1851. The Ride of the Valkyries is one of Wagner's best-known pieces. It stands out in part because of its references in popular culture, where it is used to represent stereotypical Grand Opera. In the opera-house, the Ride, which takes around eight minutes, begins in the prelude to the Act, building up successive layers of accompaniment until the curtain rises to reveal a mountain peak where four of the eight Valkyrie sisters of Brünnhilde have gathered in preparation for the transportation of fallen heroes to Valhalla. As they are joined by the other four, the familiar tune is carried by the orchestra, while, above it, the Valkyries greet each other and sing their battle-cry.