Johann Strauss (son) (1825-1899) acquired the title of “King of Waltz” only in the musical field, but as a prominent member of Vienna’s high society in the 19th century he also socialised with people of noble descent. For example, he was friends with Ferdinand I. (1861-1948), who was then prince and later king of Bulgaria. In 1893, when he was about to get married to Princess Marie Louise of Bourbon-Parma (1870-1899), Strauss composed two pieces of music for the young couple: a waltz for the bri...