Johann Strauss II was an Austrian composer of light music, particularly dance music and operettas. He composed over 500 waltzes, polkas, quadrilles, and other types of dance music, as well as several operettas and a ballet. In his lifetime, he was known as "The Waltz King", and was largely then responsible for the popularity of the waltz in Vienna during the 19th century. Some Strauss’ most famous works include "The Blue Danube", "Kaiser-Walzer", "Tales from the Vienna Woods", and the "Tritsch-Tratsch-Polka". Among his operettas, "Die Fledermaus" and "Der Zigeunerbaron" are the best known.