Cristina Rae emerged as a frontrunner on Tuesday's season 15 live finale of America's Got Talent, in which judge Howie Mandel called her 'the one to beat.'The Nashville singer shone in the spotlight as she unleashed her powerful vocals on the 2012 song Demons by Imagine Dragons, hitting incredible high notes at the end.'Save the best for last,' raved judge Heidi Klum, 47, who'd given Cristina her Golden Buzzer during auditions. 'Everyone is amazing, but you are the most amazing.
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