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 romance by Gottfried von Straßburg. It was composed between 1857 and 1859 and premiered in Munich on 10 June 1865 with Hans von Bülow conducting. Wagner referred to "Tristan und Isolde" not as an opera, but called it "Eine Handlung" (literally drama or plot), which was the equivalent of the term used by the Spanish playwright Calderón for his dramas.

Wagner's composition of Tristan und Isolde was inspired by his affair with Mathilde Wesendonck and the philosophy of Arthur Schopenhauer. Widely acknowledged as one of the peaks of the operatic repertory, Tristan was notable for Wagner's advanced use of chromaticism, tonality, orchestral colour and harmonic suspension.

The opera was profoundly influential among Western classical composers and provided inspiration to composers such as Gustav Mahler, Richard Strauss, Karol Szymanowski, Alban Berg and Arnold Schoenberg. Many see Tristan as the beginning of the move away from conventional harmony and tonality and consider that it lays the groundwork for the direction of classical music in the 20th century.