Before Maria Taylor and Mike Macdonald shared the stage at the Lombardi Trophy presentation, they were high school classmates in Georgia.

At Centennial High School in Roswell, Georgia, one classroom stands out from the rest—and it sounds more like a TV studio than a typical school setting.

Carnegie Hall, since its doors opened in New York City in 1891, has been a place where musicians and singers have dreamed about performing. That dream will soon become a reality for a select group of ...