Blessed with a powerful voice that invited comparisons to Mariah Carey, Leona Lewis transcended her 2006 win of the U.K. music competition The X Factor to become an international superstar. Much of that success is due to the international smash "Bleeding Love," a steely soul power ballad that topped the charts in the U.S., U.K., Australia, Canada, and throughout Europe. Its success turned Lewis into a celebrity in 2007 and its accompanying debut, Spirit, solidified that status, selling over seven million copies throughout the world. Lewis never replicated that success, but her...