The background vocals most prominently heard at the 3:26 mark are "If they say, "She's keeping him by keeping him around". Steve Porcaro (the original songwriter of the Human Nature demo) confirmed this in a 2014 interview: http://en.michaeljackson.ru/steve-porcaro-chicago-1945/
The background vocals most prominently heard at the 3:26 mark are "If they say, "She's keeping him by keeping him around". Steve Porcaro (the original songwriter of the Human Nature demo) confirmed this in a 2014 interview: http://en.michaeljackson.ru/steve-porcaro-chicago-1945/