To be precise: 'Say Something' by Great Big World, featuring Christina Aguilera.
"My four-year old heard the song come on, so I changed it. But he wanted it back on for some reason," explains Mark Blitch. "Here is the first moment that he has been 'moved'."
Aww. Bless you, little Jackson. You're a sensitive young soul. And we like that.
(Via Daily Picks And Flicks)