Erm...lemme think...nope Janet, Mariah, Whitney, Beyonce, Toni Braxton, Rihanna, Christina Aguilera, MJ, Donna Summer (all flawless). And she's epic on her own material too...I take it you've seen the Who's Loving you at the MJ tribute (youtube it)....Girl slayed. With a voice like that, why are 1D in the US at the top of itunes and not her? It's a crime IMO.
Beyoncé Lady Gaga Little Mix Ciara
J Hud MJ Prince DC Madonna Motown
The Trinity Ms Burke Emeli Sandé Nicki Minaj Janelle Monáe
Marina & The Diamonds Florence & The Machine Ellie Goulding