Herbert von Karajan was an Austrian conductor. He was principal conductor of the Berlin Philharmonic for 34 years. During the Nazi era, he debuted at the Salzburg Festival, with the Vienna Philharmonic, the Berlin Philharmonic, and during World War II he conducted at the Berlin State Opera. Generally regarded as one of the greatest conductors of the 20th century, he was a controversial but dominant figure in European classical music from the mid-1950s until his death. Part of the reason for this was the large number of recordings he made and their prominence during his lifetime. By one estimate, he was the top-selling classical music recording artist of all time, having sold an estimated 200 million records.

Tristan und Isolde, WWV 90, is an opera in three acts by Richard Wagner to a German libretto by the composer, based largely on the 12th-century romance Tristan and Iseult by Gottfried von Strassburg. It was composed between 1857 and 1859 and premiered at the Königliches Hoftheater und Nationaltheater in Munich on 10 June 1865 with Hans von Bülow conducting. Wagner referred to the work not as an opera, but called it "eine Handlung".