Well, that's the 'apprenticeship' method
Maybe you didn't check which orquestas were playing on the way in? Or you didn't ask the DJ what that tanda was?
Not every AT afficionado can, or wants, to study the history of the various orchestras, singers, groups, bands, recordings, etc., or listen to an AT music stream.
How about the idea of informing dancers what's going to be played beforehand? And do it in useful, unobtrusive, snippets before the tanda? Might even educate some dancers. Might even spark an interest in, say, d'Arienzo or Canaro (other orchestras are available). Maybe they seek out that music and even do some practice to it. Or tell the DJ that the awful digitisation, complete with scratches and poor dynamic range, of some obscure 1920's piece just wasn't danceable, but there's a later recording which is.