It Takes Two: 10 Songwriting Duos That Rocked Music History
It Takes Two: 10 Songwriting Duos That Rocked Music History

As always, submit your questions about Billboard charts, sales and airplay, as well as general music musings, to askbb@billboard.com. Please include your first and last name, as well as your city, state and country, if outside the U.S.

CHRISTINA AGUILERA'S CAREER SALES

Hi Gary,

I'm a big