Five decades after the first description of the humpback whale song in the Northern Hemisphere, and two decades after the first description of a cultural revolution in the eastern Australian population, this Note provides evidence of an abrupt change (leastways) of the song occurred in 2018 season, in breeding stock A. This intense song change measured by simplified Levenshtein distance implies cultural revolutions could be happening in the Atlantic ocean as well, further stressing the possibility of Southern Hemisphere Cultural Exchange (SHCE) phenomenon.