[Tango-L] Vocals and Dancing

[Laura V]

What I don't understand about the milongueros who don't dance to music 
with vocals, does this mean they only dance to music they recognize? Is 
it possible to know all of the hundreds (1000s?) of danceable, 
golden-age selections to know which ones contain vocals, or do they have 
to sit out a lot, or at least for the first song in a tanda to make sure 
it's an instrumental, and then hope the rest of the tanda is 
instrumental as well. It's not even enough to just recognize the song, 
but you would have to know which version is being played, as I believe 
there exist vocal and non-vocal versions of some songs. Or is it easier 
than I think to recognize an instrumental right away? I admit I've never 
really thought about this, maybe I should test my skill at it.

Laura