They dance TANGO in Naples?

It's one of those mistakes..... by a very well known author!
From "A year in the World", by Frances Mayes, Publisher Broadway Books, Pg. 118:
"We stop to listen to four musician who are playing brazilian music with gusto. Suddenly, a couple steps away from our small crowd and begins to tango in the street. Naples. When else in the world does someone tango in the streets?"
Tango in the streets of Naples?; with four musician playing brazilian music?
Please Frances, could you tell us where you really were? Or you mixed Brasil with Buenos Aires and Naples with La Boca?