From my Kenny diary - 18 years ago. (Kenny was 3 at the time).
Kenny enjoys music quite a bit. He will take a bat, or another toy, and run through the house pretending it's his guitar. He literally wears himself out doing it. He also makes up songs about Joey, and even makes sure the words rhyme. Pretty good for a 3 year old.
Kenny was hitting Joey on the head with a toy. His mom told him to stop, or she'd take the toy away. He thought about it, and hit Joey one more time. Beth took away the toy, and Kenny said "It's okay, I didn't want it anyway”.
Based on this we weren't sure if he would be a musician or a criminal.
Fortunately we now know - he's a musician. And a really good one at that.