<Tr> <Th> Songwriter (s) </Th> <Td> Joe Brooks </Td> </Tr> <Tr> <Th> Producer (s) </Th> <Td> Joe Brooks </Td> </Tr> <P> "You Light Up My Life" is a ballad written by Joseph "Joe" Brooks, and originally recorded by Kasey Cisyk for the soundtrack album to the 1977 film of the same name . The song was lip synched in the film by its lead actress, Didi Conn . The best - known version of the song is a cover by Debby Boone, the daughter of singer Pat Boone, which held the #1 position on the Billboard Hot 100 chart for ten consecutive weeks in 1977, setting a new record for that time . </P> <P> Cisyk's original soundtrack recording was included on the film's soundtrack album, and later released as a single to bolster sales of the soundtrack album after Debby Boone included her version on her first solo album (also entitled You Light Up My Life). Although the soundtrack album was certified Gold, peaking at #17 on the Billboard 200 albums chart, it never included Boone's hit single version of the song . </P>

Who sings the song you light up my life