Tango musicality, rhythm or melody?

All tango dancers start out dancing to the beat or rhythm.  If it's hard to find here is an easy tip: use your head.  Nod your head down on the down beats.  You'll quickly find the rhythm if you use your head.  After that, tango dancer's will spend a LOT of time dancing to the melody. 

By definition the singer is always carrying the melody.  99% of the time so are the string instruments.  That's an easy way to start, just dance to the singer or the violins.

Here is a web page with visible tips:

https://endretango.com/en/develop-your-tango-musicality-instruments-rhythm-melody/