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Britain’s Got Talent underdog Susan Boyle, X Factor judge and Girls Aloud singer Cheryl Cole, pop star Miley Cyrus, R&B diva Mariah Carey and rock icon Rod Stewart have all recorded their part for the cover, whose proceeds will be entirely redirected to organizations offering help to Haiti. Michael Buble, Mika, Kylie Minogue, Westlife, James Blunt, Alexandra Burke and many others have also lent their voices for a good cause, the publication says.