query: Where was Tristan und Isolde first performed?
passage: Tristan und Isolde
Tristan und Isolde (Tristan and Isolde, or Tristan and Isolda, or Tristran and Ysolt) is an opera, or music drama, in three acts by Richard Wagner to a German libretto by the composer, based largely on the 12th-century romance Tristan by Gottfried von Strassburg. It was composed between 1857 and 1859 and premiered at the Königliches Hof- und Nationaltheater in Munich on 10June 1865 with Hans von Bülow conducting. Wagner referred to the work not as an opera, but called it "eine Handlung" (literally a drama, a plot or an action), which was the equivalent of the term used by the Spanish playwright Calderón for his dramas.
passage: Tristan und Isolde
The score of Tristan und Isolde has often been cited as a landmark in the development of Western music.[15] Throughout the opera, Wagner uses a remarkable range of orchestral colour, harmony, and polyphony, doing so with a freedom rarely found in his earlier operas. The very first chord in the piece, the Tristan chord, is of great significance in the move away from traditional tonal harmony as it resolves to another dissonant chord:[16]