Austrian composer johann strauss (1825— 1899) is the "king of waltzes". He wrote many waltzes in his life, the most famous of which is the Blue Danube. 1866, the Puao War broke out. That is, on July 3 of this year, the Austrian army was defeated in the Battle of Sadova. Under the oppression of Prussia, the momentum of repression enveloped the whole of Vienna. In order to reverse the frustration of Viennese citizens, johann strauss was entrusted to write a piece of music. However, johann strauss is not confident in vocal music creation, especially in choral works. So he had to write a song without lyrics first, and then the lyricist filled in the lyrics. 1867, The Blue Danube was completed, but when it premiered in Vienna, it did not attract more attention and the response was average. On July 30th of the same year, at the Paris World Expo, the composer personally conducted the band to play the Blue Danube again, but this time it was warmly welcomed. The Blue Danube consists of a prelude, five small waltzes and an ending, which is popular all over the world. Danube is a big river that flows through Vienna. As a symbol of Austria, it is vividly displayed in this waltz. Especially the order of music-the vibration of the violin reminds people of the ripples of the Danube; The theme sound played by the trumpet slowly echoes the falling tone of wind instruments in the high-pitched area, as if it were the slow flow of the Danube. The whole overture music is vivid and vivid, and the beautiful music is touching, which makes people think: Oh, this is the Danube! This is Vienna! Because of the relationship between the Blue Danube and this big river that affects the Austrian people, and because of its position in the hearts of people all over the world, it is often called the unofficial second national anthem of Austria.