The Waltz is one of the five international ballroom dances in the Modern or Standard style. It is danced socially, and in ballroom competitions. Like its older brother, the Viennese waltz, this dance originated in Vienna, but was greatly modified by English dance teachers in the 1920s. That is why it is sometimes called the English waltz. Other names are the diagonal waltz, the international waltz, and the slow waltz.