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The Biebs' ever-present manager, Scooter Braun, reveals why the "Mistletoe" singer's voice is a little deeper and smoother on his new album, saying it's because his vocal cords have matured. "Vocally, his balls have dropped," Braun told Billboard. (lol) Braun explained that the "Baby" singer will still be able to charm his fans with that voice of his, even if it changes as he matures. Braun said that the remix of "All I Want for Christmas Is You" with Mariah Carey on Bieber's new Christmas album was a bit difficult for him to sing, because Mariah wanted the song sung in her original key. "That was the hardest song to do," Braun tells the magazine. "A year ago that would have been no problem." Bieber agreed that it "was high," but that he was eventually able to hit the notes. "Yes, that was high, but I grinded it out and we got it down," the singer said. Source With the horrible auto tune, he just ruined Mariah's classic. But of course he needed the auto tune, noone could ever match the vocal prowess of Mariah.