There's nothing better than hearing isolated vocal tracks.

On Wednesday night, diva Mariah Carey performed her hit "All I Want For Christmas Is You" at the Christmas tree lighting at Rockefeller Center in New York.

To those watching on NBC, it seemed like it was business as usual.

But after hearing her isolated vocals from the s video below, you quickly realize that was not the case at all.

It appears as though Carey has lost a bit of her range. And by a bit, we mean a lot.

What we want to know is: Who did Carey piss off so much that they released this just HOURS after the performance?!