"Let's Fix This" -- your comment above doesn't make sense for the people who were there. The Christmas concert was fire throughout, and that moment with the 3 ladies was magic. We go to MC's concerts for her and do not expect a Beyonce choreographed routine..duh! I loved how Mariah changed the climax whistle at the ad lib. When you have J-hud and Mariah there, it's hard for Ariana to keep up, vocally, but they all did amazing, regardless!