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 operatic works are his primary artistic legacy. Unlike most opera composers, who generally left the task of writing the libretto (the text and lyrics) to others, Wagner wrote his own libretti, which he referred to as "poems". From 1849 onwards, he urged a new concept of opera often referred to as "music drama" (although he later rejected this term), in which all musical, poetic and dramatic elements were to be fused together—the "Gesamtkunstwerk". Wagner developed a compositional style in which the importance of the orchestra is equal to that of the singers. The orchestra's dramatic role in the later operas