It’s two days before The X Factor‘s final five contestants take the live stage and Simon Cowell isn’t happy. Sitting in on contestant Melanie Amaro’s rehearsal, Cowell and the vocal coaches are debating the tempo for a dance version of Adele’s “Someone Like You.” “It needs to be bigger!” emphasizes Cowell, who — along with mentors L.A. Reid, Nicole Scherzinger and Paula Abdul — is gearing up for the Fox talent competition’s December 22 finale. We caught up with the final four acts to dissect their keys to success — and their…
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