Wolof now?

A week or so ago, he stunned me by counting to ten in Spanish. Now the youngest is singing along with Youssou N'Dour. I had no idea he spoke

Wolof
noun
1. A member of a West African people primarily inhabiting coastal Senegal.
2. The West Atlantic language of this people, widely used as a lingua franca in Senegal.
"Wolof." The American Heritage® Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. Answers.com 06 . 2006. http://www.answers.com/topic/wolof

(In truth, I know he doesn't, that he's just imitating the sounds.)