I spent a lot of time in Japan when in the service. I never saw a nappy headed japanese person. Not even curly headed. But that was 55 years ago. No telling what happened since then. I still enjoyed the performance. And that is taking nothing from Stevie Wonder. I liked it then. The term was just a description of what a little mischevious boy would be. Could have been snotty nosed, or smart blank, blank, blank boy.(fill in according to race) They were true to the song. I just wish that I could play like that.
LOL
They must have some left over oats in their genes.

....or maybe a really good perm.
Dunno.