Opera heard in his earlier operas such as "Der fliegende Holländer", "Tannhäuser" and "Lohengrin"; and he was prepared to violate accepted musical conventions, such as tonality, in his quest for greater expressivity. In his mature music dramas, "Tristan und Isolde", "Die Meistersinger von Nürnberg", "Der Ring des Nibelungen" and "Parsifal", he abolished the distinction between aria and recitative in favour of a seamless flow of "endless melody". Wagner also brought a new philosophical dimension to opera in his works, which were usually based on stories from Germanic or Arthurian legend. Finally, Wagner built his own opera house at Bayreuth with part
Richard Wagner be treated with kindness and consideration, but, except at a distance, [was] a menace to his peace of mind." Wagner continued his correspondence with Mathilde and his friendship with her husband Otto, who maintained his financial support of the composer. In an 1859 letter to Mathilde, Wagner wrote, half-satirically, of "Tristan": "Child! This Tristan is turning into something "terrible". This final act!!!—I fear the opera will be banned ... only mediocre performances can save me! Perfectly good ones will be bound to drive people mad." In November 1859, Wagner once again moved to Paris to oversee production of a new