Tango originated among European immigrant populations of Argentina and Uruguay. The music developed from the influence of the African rhythms, combined with the instruments and techniques brought in by European immigrants. It is danced in an embrace that can vary from very open (arms length) to very closed (chest to chest), and relies heavily on improvisation as there is no "Basic Step". Ladies traditionally wear skirts or babuchas pants and the men traditionally dress in tight fitting shirts and pants, and sometimes a fedora hat.