5. Mariah Carey
Mariah Carey's last single, Triumphant (Get 'Em) may not have been the strongest start to her latest album campaign (it peaked at #144 in the UK), so let it forever be branded a 'buzz single' and forgotten about. Now Mimi has the gargantuan platform of American Idol, it is a near certainty that things will improve on Triumphant - just look at what Idol did for Jennifer Lopez's career. If the singer can present audiences with some strong (or even simply passable) material, then surely Mariah can regain her place at the top of the mainstream charts - a place that she's not been since 2008's Touch My Body. As well as Idol, the diva is also recording the theme for Sam Raimi's Oz: The Great and Powerful, so we may potentially have another Somewhere Over The Rainbow style classic coming our way this year. http://www.youtube.com/watch?v=H1Yt0xJKDY8