Der Zigeunerbaron is Strauss's second most popular operetta after Die Fledermaus. Its 1885 premiere had political resonance; the plot popularized the Dual (Austro-Hungarian) Monarchy which was to come to an end with the First World War. The aria of Homonay Her die Hand, es muss ja sein is sung at the end of the 2nd act and is one of the most popular pieces from the operetta. This aria is also known as Das Werbelied.