In addition to the [Argentine] Tango, tangueros and tangueras also dance, albeit less frequently, the Milonga (the predecessor to the Tango) and the Vals Cruzada (a Waltz with figures that resemble the Argentine Tango).
Vals Crusada is frequently refered to as Tango Vals, or simply Vals (Waltz in Argentina...)
Vals is more like dancing Tango to Waltzy-Tangoy music, with some waltz like timing, than it is dancing a waltz with tango-like steps. Most steps are tango steps, few are waltz steps.
An argentine tango dance party is called a Milonga. Milonga means both a kind of dance (danced to Milonga music) and a type of dance (where tangueros and tangueras dance Tango, Milonga and Vals). [J.C. Dill jcdill@ix.netcom.com ]