In 1977, a heartfelt ballad took over the airwaves and refused to let go. "You Light Up My Life," performed by Debby Boone, became one of the most dominant songs of its era, spending an incredible 10 ...

Debby Boone was just 21 years old when she recorded "You Light Up My Life" — and it turned out to be the biggest single of the entire 1970s. The song didn't just hit No. 1 on the Billboard Hot 100. It ...