The dances that make up the list of DanceSport dances are performed competitively at amateur and professional levels throughout the world. Ten international style ballroom dances—five Standard and five Latin—are defined by the World Dance Council (WDC), which has world-wide membership of all countries taking part in ballroom competitions. Besides determining which dances are performed, these organizations specify many other aspects of their competitions, for instance, the tempo of music allowed and the duration of each competition round.