Richard Wagner classical music. His "Tristan und Isolde" is sometimes described as marking the start of modern music. Wagner had his own opera house built, the Bayreuth Festspielhaus, which embodied many novel design features. The "Ring" and "Parsifal" were premiered here and his most important stage works continue to be performed at the annual Bayreuth Festival, run by his descendants. His thoughts on the relative contributions of music and drama in opera were to change again, and he reintroduced some traditional forms into his last few stage works, including "Die Meistersinger von Nürnberg" ("The Mastersingers of Nuremberg"). Until his final years, Wagner's
Good Friday religious holiday, including Good Friday, but only so long as the state can provide a valid secular purpose that coincides with the obvious religious purpose of the holiday. Good Friday is the Friday before Easter, which is calculated differently in Eastern Christianity and Western Christianity (see Computus for details). Easter falls on the first Sunday following the Paschal Full Moon, the full moon on or after 21 March, taken to be the date of the vernal equinox. The Western calculation uses the Gregorian calendar, while the Eastern calculation uses the Julian calendar, whose 21 March now corresponds to the Gregorian