The Blue Danub, Op. 314

Johann Strauss II (October 25, 1825 – June 3, 1899), also known as Johann Baptist Strauss or Johann Strauss, Jr., the Younger, or the Son (German: Sohn), was an Austrian composer of light music, particularly dance music and operettas. He composed over 400 waltzes,polkas, quadrilles, and other types of dance music, as well as several operettas and a ballet. In his lifetime, he was known as "The Waltz King", and was largely then responsible for the popularity of the waltz in Vienna during the 19th century. Strauss had two younger brothers, Josef and Eduard Strauss, who became composers of light music as well, although they were never as well known as their elder brother. Some of Johann Strauss's most famous works include The Blue Danube, Kaiser-Walzer, Tales from the Vienna Woods, and the Tritsch-Tratsch-Polka. Among his operettas, Die Fledermaus and Der Zigeunerbaron are the best known. [source from Wikipedia]

This is the waltz of Johann Strauss Ⅱ with the greatest reputation. The translation of the German title is "By the Beautiful Blue Danube". It is called "the second Austrian national anthem". It is said that people live on both shore of Danube suddenly discover that it is blue after this music is composed. This work is one of the repertories of the Vienna New Year's Concert, and is performed exactly at midnight on New Year's Eve as the tradition.