There are a few ways to experience tango while in Buenos Aires. Milongas are probably the most popular option, where people of all skill levels join in the dancing. And there are recitals with excellent music, usually no dancing, but possibly the most authentic. Or, you can choose the full-on tourist experience of the dinner show.
"What do you know about Buenos Aires?" That's the question posed to Barcelonan detective Pepe Carvalho at the beginning of Manuel Vázquez Montalbán's excellent crime novel Quinteto de Buenos Aires. Carvahlo's response mirrors what mine would have been: "Tango, desaparecidos, Maradona". I suppose I might have added Evita. Not much else.