I have an adapted, borrowed theory. To dance well, you need to have some kind of understanding about the lyrics. Go to any workshop (good or bad) and the Spanish speakers will always extol about the importance of the lyrics in tango. When I attended a workshop with Los Disparis (a good workshop by the way) they spoke of how the tango lyrics were the ordinary man’s poetry and show us his dreams and fears [See my entry on their class here].
My Spanish is pretty basic but I’m trying to make it a habit to get a translation of at least the title of some of my favourite tangos. Obviously, the whole song is ideal but the title is a good starting point. I also think it’s quite important to learn a few words/phrases that come up in a lot of tango songs. I’m starting simple, ‘corazon’ (heart), ‘mi vida’ (my life) ‘penas’ (pain, sorrows) and then sometimes when I’m dancing I’ll hear one of these words sung out over the melody and I’ll suddenly feel something shift inside me as I understand just a little bit more about what I am dancing to and why.
Well that is my theory. I’ve now told it to two leaders on separate occasions and both have argued against it and said that understanding the English version wouldn’t help their dancing in any way (and one even speaks intermediate Spanish). Perhaps you need to have a certain mindset to go with this idea.