1864 wrote the tragic love story Tristan und Isolde and his only mature comedy Die Meistersinger von Nürnberg (The Mastersingers of Nuremberg), two works that are also part of the regular operatic canon. Tristan is often granted a special place in musical history; many see it 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. Wagner felt that his musico-dramatical theories were most perfectly realised in this work with its use of "the art of transition" between dramatic elements and the balance achieved between vocal and orchestral lines. Completed in 1859, the work was given its first performance in Munich, conducted by Bülow, in June 1865. Die Meistersinger was originally conceived by Wagner in 1845 as a sort of comic pendant to Tannhäuser. Like Tristan, it was premiered in Munich under the baton of Bülow, on 21 June 1868, and became an immediate success. Millington describes Meistersinger as "a rich, perceptive music drama widely admired for its warm humanity", but its strong German nationalist overtones have led some to cite it as an example of Wagner's reactionary politics and antisemitism. Completing the Ring When Wagner returned to writing the music for the last act of Siegfried and for Götterdämmerung (Twilight of the Gods), as the final part of the Ring, his style had changed once more to something more recognisable as "operatic" than the aural world of Rheingold and Walküre, though it was still thoroughly stamped with his own originality as a composer and suffused with leitmotifs. This was in part because the libretti of the four Ring operas had been written in reverse order, so that the book for Götterdämmerung was conceived more "traditionally" than that of Rheingold; still, the self-imposed strictures of the Gesamtkunstwerk had become relaxed. The differences also result from Wagner's development as a composer during the period in which he wrote Tristan, Meistersinger and the Paris version of Tannhäuser. From act 3 of Siegfried onwards, the Ring becomes more chromatic melodically, more complex harmonically and more developmental in its treatment of leitmotifs. Wagner took 26 years from writing the first draft of a libretto in 1848 until he completed Götterdämmerung in 1874. The Ring takes about 15 hours to perform and is the only undertaking of such size to be regularly presented on the world's