Today's YouTube Friday Clip of the Week is another one that will get you in festive spirit. Late Night with Jimmy Fallon brought on superstar Mariah Carey to sing a Christmas song. But instead of just singing, Jimmy Fallon and his house band The Roots accompanied Mariah with an array of instruments that can be found in an elementary school music room. They played and sang the holiday classic "All I Want For Christmas is You". This isn't the first time the group has played a hit on a recorder. Earlier this summer they invited pop sensation Carly Rae Jepsen to sing her hit "Call Me Maybe".