Parsifal is an opera, or music drama, in three acts by Richard Wagner. It is loosely based on Wolfram von Eschenbach's Parzival, the medieval (13th century) epic poem of the Arthurian knight Parzival (Percival) and his quest for the Holy Grail. Wagner first conceived the work in April 1857 but it was not finished until twenty-five years later. It was to be Wagner's last completed opera and in composing it he took advantage of the particular sonority of his Bayreuth Festspielhaus. Parsifal was first produced at the second Bayreuth Festival on 26 July 1882 in a performance conducted by Hermann Levi. The Bayreuth Festival maintained an exclusive monopoly on Parsifal productions until 1903, when the opera was performed at the Metropolitan Opera in New York. Wagner preferred to describe Parsifal not as an opera, but as "ein Bühnenweihfestspiel" – "A Festival Play for the Consecration of the Stage". At Bayreuth a tradition has arisen that there is no applause after the first act of the opera.