No one can keep up with Christina. Britney can not anyway, has no voice volume and sounds in their songs as a 10-year. Quite different Christina: She meets every note perfectly and has an incredible voice. No matter what she sings, it sounds always great. She has an extraordinary vocal range and I would definitely classify higher than Britney and Mariah. The songs are also great, but versatile, are not boring and are a great cheerleader for Christmas. For Aguilera fans anyway a must, also recommended for everyone else!
