What's singing?

In the car today with Mel, I turn on the radio and the classical music station is on. He asks me, "Who singin?" I was a little confused since no one was singing and said, "Singing? No one is singing."

He then asks, "What dat?"

And I figured out he meant the piano in the song. So I told him, "Piano. It's a piano playing." He then tells me, "Pa-ano singin!"

I really like that. 

And while waiting for Carolina to come out of school, he suddenly sees her teacher come to the door and starts yelling and jumping (with joy) "Ma Rigiz! Ma Rigiz!!"  ("Mrs. Rodríguez").