The Blue Danube was a waltz composed by Johann Strauss II of Earth in the 19th century. In order to celebrate Captain Benjamin Sisko's approval of taking their analysis regarding the Dominion War to Starfleet Command in 2374, four genetically engineered Humans, Jack, Lauren, Patrick, and Sarina Douglas held a party with Doctor Bashir. They drank champagne and danced to Strauss' Blue Danube waltz. (DS9: "Statistical Probabilities")