“You Light Up My Life” is a ballad written by Joseph Brooks, and originally recorded by Kasey Cisyk for the soundtrack to the film of the same name. The song was lip synched in the film by its lead, Didi Conn. Background Cisyk’s original soundtrack recording was released as a single to bolster sales of the soundtrack, after Debby Boone included her version on her first solo album also entitled You Light Up My Life. (Although the soundtrack was certified gold, peaking at No. 17 on the Billboard 200 albums chart, it never included Boone’s version of the song.) Cisyk’s single was credited to “Original Cast”, not to Cisyk herself, and only reached No. 80 on the Billboard Hot 100.
Brooks also released an instrumental version of the song from the soundtrack as a single, but his version failed to chart. Boone’s success resulted in Grammy nominations for Best Pop Vocal Performance Female and Record of the Year and won her the 1977 Grammy for Best New Artist and the 1977 American Music Award for Favorite Pop Single.
The song earned Brooks the 1977 Best Original Song awards Golden Globe and Academy Awards. The song ranks #7 on Billboard’s All Time Top 100.