Rihanna 's Voice is distinct and recognisable. Her songs cannot be covered by anyone else and be his. Imagine anyone else singing diamonds or we found love... It just wouldn't have the same impact. Love her or hate her, he voice is unique...

Same as Beyonce, her voice is unique. No one can sing if I were a boy or halo, dangerously in love in the same way...

This is what makes the so successful