Christina has always had a deep, rich voice with beautiful tone. She was doing justice to deep voiced Toni Braxton's "Another Sad Love Song" when she was only 12 years old. Christina's singing on the Burlesque soundtrack is very rich and full, in my opinion, even more so than in the Stripped or B2B era. And the power and precision with which she hits those notes on Beautiful People is off the charts. I don't think she's lost anything. She might even be better.