Elevate Difference   Christina Aguilera has been a polemic
figure since her breakthrough hit "Genie in a Bottle". She has a
sexual aesthetic similar to a young Madonna’s, fashion sense
like Cher’s, and raw vocal power comparable to a younger Whitney
Houston’s. Her albums contain raunchy sexed-up tracks that
appeal to sexually blossoming young adults and stately ballads
that appeal to their post-menopausal mothers. Power pop, pop
rock, R&B, hip-hop, dance, and even a little alt-rock have been
found in some form on her albums. It’s a curse and a blessing
for Christina that she can sound like anyone and sing almost
anything. She’s always been difficult to categorize. Her ability
to be so many things has caused critics to chastise her for not
having her own unique presence.  The campaign for the
collaboration-heavy Bionic began in the blogosphere with the
declaration “Aguilera goes indie.” Ladytron, Le Tigre,
Goldfrapp, M.I.A., Santigold, John Hill, and Sia all stepped up
to the plate when an apprehensive Aguiler