Actually, I don't think that anyone can get very far with tango - and certainly not as an improvised dance, if they don't feel the rhythms of the music. Understanding can come at many levels, of course, and anyone's capacity to decode the music will change, over time, and to some extent reflect the community in which they dance (if only, because of the available pool of partners). A teacher's job is to introduce ideas, concepts and techniques. The students job is to be open to ideas - and by no means just the teacher's - and to experiment and internalise. We each make out own tango, from a variety of influences and sources. If we know nothing of the music of tango, then a teacher with musical sensitivity (and some show little sign of it, sadly) can help a student to progress, or to unlock doors that seemed barred, but the real work is always done by the students. The exception, of course, is the teacher whose goal is to produce dancing clones of themselves: look at me - this is tango - dance like me. No thanks.