<Li> Martin Gish as Harold Nussbaum </Li> <Li> Ken Olfson as 1st Commercial Director </Li> <P> The film received the Academy Award for Best Original Song, the Golden Globe Award for Best Original Song as well as the Grammy Award for Song of the Year for the title song "You Light Up My Life ." The song was written by Joseph Brooks and sung for the film's soundtrack by Kvitka "Kasey" Cisyk . </P> <P> The song was later recorded by Debby Boone, and upon its release, it was #1 on the Billboard Hot 100 for a record - setting 10 consecutive weeks, making it the biggest hit of the 1970s . It earned Debby Boone a Grammy Award for Best New Artist . </P>

Who sang you light up my life in the movie