"The Blue Danube" (German: An der schönen blauen Donau, lit. 'By the Beautiful Blue Danube', Op. 314) is a waltz by the Austrian composer Johann Strauss II, composed in 1866. Originally performed on 15 February 1867 at a concert of the Wiener Männergesang-Verein (Vienna Men's Choral Association), it has been one of the most consistently popular pieces of music in the classical repertoire. Its initial performance was considered only a mild success, however, and Strauss is reputed to have said, "The devil take the waltz, my only regret is for the coda—I wish that had been a success!"
After the original music was written, the words were added by the Choral Association's poet, Joseph Weyl. Strauss later added more music, and Weyl needed to change some of the words.