Who is the little boy in commercial who plays a piano onstage and then pianist comes out it with him?

The little boy in the commercial you're describing is Luca Wing, a talented musical prodigy known for his exceptional piano skills. He gained prominence by appearing in a touching commercial alongside renowned pianist Lang Lang. In the commercial, Luca starts playing a grand piano on stage as a child and transitions into an older version of himself, played by Lang Lang, who continues the performance gracefully. Luca Wing's natural aptitude for music captured the hearts of viewers, making him a recognizable personality in the world of music.