“You Light Up My Life” was originally sung by Kasey Cisyk for the soundtrack to the 1977 film “You Light Up My Life.”

Debby Boone’s version of the song topped the Billboard Hot 100 for 10 weeks and was certified Platinum. It also topped Billboard’s Adult Contemporary chart as well. By the end of the decade, Boone’s version was the most successful single of the 1970s.