The categories in which I think of music, suitable for dancing tango, all fall into one of two main groups: music composed or arranged specifically for tango, and anything else - to which I attribute the 'alternative' label. So Old Guard and Golden Age are the two main groupings in 'traditional', but I struggle to label the stuff that came later (most of the top orchestras continued to produce concert music, long after everyone had stopped dancing). Increasingly, the distinctions have become blurred, and we dance to much of it anyway. The same is true of nuevo (has anyone mentioned nuevo?) by which I mean the likes of Piazolla, which originally was considered undanceable, and the likes of Triolo said wasn't even tango.
Perhaps as the boundaries have been pushed into dancing to all sorts of other things (eg I've come late to Tom Waits), it seems less and less sensible to draw an arbitrary line in the continuum of the development of music away from the normal limits of the traditional. The one style of music that I really don't seek out, for dancing, is the electronica stuff. I quite like to listen to some of it, but it seems to lack the variety and interest of other (invariably, shorter) material of an earlier time. It isn't aging well, either, and much of it sounds dated. It astonishes me that soon, some of the Guardia Vieja music that is still regularly played will be 100 years old. Gotan, recently produced a 10th anniversary edition of its earliest material - will we be intereted at 25, or 50, or 100?
Having said that, one of the tracks on Electrocutango's latest: Pugliando is brilliant, and Michael Lavocah is absolutely right in saying:
Perhaps not for dancing, Pugliando is a work of genius - a Pugliese sample given the electronic treatment. In a way it's more respectful than the bands who try (and fail) to reproduce the Pugliese sound.
My only quibble is that it is not for dancing: I'd give it a go. I don't know what I'd put it with, but Otros Aires' later 'La Yumba' might be one partner. Any other suggestions?