Mandy Harvey's voice was heard around the world Tuesday night, but her story starts back in a CSU music class.

The 29-year-old Florida singer wowed judges on NBC's competition show "America's Got Talent" and her performance, featured on the show's Facebook page, garnered more than 1 million reactions and shares overnight into Wednesday.

A singer since she was 4, Harvey unexpectedly lost her hearing to a connective tissue disorder at 18. At the time, she was a music education student at Colorado State University and, on the show, she recounted the last day she was able to attend a music class as her condition worsened during the 2006-2007 school year.

"Everything that I'd ever wanted was just going away, and I couldn't stop it," she said, in tears, on the show.

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