All I Want for Christmas is The Rob's favorite Christmas song, but I doubt he's ever heard it like this!

When you spend as much time working with someone like Rob & I do, you learn a lot about each other. For instance, Mariah Carey's All I Want for Christmas is You is Rob's favorite Christmas song. So of course, when I ran across Mariah performing the song with The Roots and Jimmy Fallon, and using instruments that you'd see in a preschool classroom, I had to share it!