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Christina Aguilera - 'It's a Mans Mans Mans World' (2007)
Before "The Voice," tour cancellations and generally odd behavior started to overshadow her natural talents, Xtina had the look, the superstar presence and that voice. In '07, she took to the Grammys to honor the Godfather of Soul, James Brown, with this scorching rendition of his '60s hit about sexual politics. Come back, Christina!