Xtina is, hands down, one of the greatest vocalists of her generation. And she has spent the better part of two decades figuring out what exactly to do with that voice. There was the bubblegum of her self-titled 1999 debut and her transition into R&B-infused, low-rise jean'd adulthood. Then came concepts: old school sound of 2006's Back to Basics and the electro-futurism of
This article originally appeared on www.rollingstone.com: Review: Christina Aguilera Flexes Her Diva Power on the Excellent ‘Liberation’