"The Blue Danube" is the common English title of "An der schönen blauen Donau", Op. 314 (German for "By the Beautiful Blue Danube"), a waltz by the Austrian composer Johann Strauss II, composed in 1866. Originally performed on 15 February 1867 at a concert of the Wiener Männergesangsverein (Vienna Men's Choral Association), it has been one of the most consistently popular pieces of music in the classical repertoire. (Wikipedia)