Bayreuth Festival talented conductor Hermann Levi, who was personally chosen by Richard Wagner to conduct the debut of "Parsifal" in 1882 with the assistance of the young Engelbert Humperdinck. Following Wagner's death, his widow Cosima continued running the festival at one or, more frequently, two-year intervals. She gradually introduced the remaining operas which complete the Bayreuth canon of Wagner's last ten completed operas. Levi, the son of a rabbi, remained the festival's principal conductor for the next two decades. Felix Mottl, who was involved with the festival from 1876 to 1901, conducted "Tristan und Isolde" there in 1886. Until the 1920s, performances
Bayreuth Festival banned her from administration of the Bayreuth Festival and its assets, which fell eventually to her two sons, Wolfgang and Wieland. During American occupation of the region after World War II, the theatre was used for army recreation and religious services for American soldiers. Only popular concerts and mixed entertainment were allowed: comedy, dancing, acrobatics, and then only "Die Fledermaus" was staged. When the Festival House was handed over to the city of Bayreuth in 1946, it was used for concerts of the Bayreuth Symphony Orchestra and the performances of such operas as "Fidelio", "Tiefland", "Madama Butterfly" and "La traviata".