Symphony No. 3 (Beethoven) which the bass theme is heard as the first variation before the main theme ultimately appears. This again parallels the structure of the Opus 35 variations themselves. Finally, the loud E chord that begins the Opus 35 variations themselves is moved here to the beginning of the first movement, in the form of the two chords that introduce the first movement. Alternatively, the first movement's resemblance to the overture to the comic opera "Bastien und Bastienne" (1768), composed by twelve-year-old W. A. Mozart, has been noted. It was unlikely that Beethoven knew of that unpublished composition. A possible explanation is
Tristan und Isolde 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 10 June 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