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At age 18, Mandy Harvey lost most of her ability to hear. As a child and during her teenage years, Mandy loved to sing. But she stopped singing for a time after she went deaf.
But then she learned to feel a song's beat through the floor of a stage. So, she decided to start singing again. She uses visual tools to keep her voice and instruments in tune. 
Harvey sings professionally. But many people did not know about her. Then she appeared on the television show "America's...