The categories below are not mutually exclusive. For example, tango is doubtless a partner dance. While it is mostly social dance, its ballroom form may be competitive dance, especially within DanceSport. At the same time it is enjoyed as performance dance, whereby it may well be a solo dance. There are tangos among round dances, and certainly participation dances can involve tango mixers. One might remember that at times it was a forbidden erotic dance. Finally, some try to trace its roots to African ceremonial dances. Not to say that tango dance reaches beyond these categories: into ice dancing, burlesque and more.