At first glance, Alec Van Khajadourian may come across as your typical Encino, California, pre-schooler: He loves playing video games, experimenting with cameras and running around his parents’ house ...

But there’s so much more to the 5-year-old than meets the eye. Or ear. “He loves doing 5-year-old stuff,” said his father, Joe Khajadourian. “But then, he sits at the piano and you’re like, ‘Wow. This ...