Argentine Tango is a progressive partner dance characterized by a close hold, a low center of gravity, and an emphasis on contra body movement.  The couples move around the floor in a counterclockwise direction.  Unlike Ballroom Tango, Argentine Tango is an improvisational form, and the hold is more of an embrace, with the couples’ upper bodies cose and the legs far apart.

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More info on Argentine Tango:
TangoMango
TangoBeat