Cisyk's original soundtrack recording was included in the film's soundtrack album. It was then later released as a single to bolster sales of the soundtrack album after Debby Boone included her version on her first solo album (also titled You Light Up My Life). Although the soundtrack album was certified Gold, peaking at No. 17 on the Billboard 200 albums chart, it never included Boone's hit single version of the song.
Cisyk's single was credited to "Original Cast", not to Cisyk herself, and even though Brooks is listed on the A-side of the single, the "Original Cast" B-side charted on the Billboard Hot 100 and only reached No. 80. Brooks also released an instrumental version of the song from the soundtrack as a promotional single, but that version failed to chart.
In a 2013 biographical essay about Cisyk,[3] Cisyk's second husband, Ed Rakowicz (who worked as a sound engineer, but not for this song), wrote that songwriter Brooks was initially pleased with Cisyk's recording of the song with orchestra (and her version appeared in the movie and soundtrack) but "tried to evade payment by false promises and by asking her to be an incidental actor in his film, implying huge rewards yet to come..."[3] Rackowicz claimed that Brooks made improper advances toward Cisyk, that after being rebuffed, he refused to speak directly to her again, and that he continued to evade payments to her while commissioning another recording with Debby Boone.[citation needed]
According to Rackowicz, "Besides wanting Boone to copy Kacey's [sic][4] iconic hit reading of his songs, Brooks needed to cover up Kacey's vocal leakage in the microphones in the piano recorded at the original demo session on which was overdubbed the orchestral track used in the film. Brooks didn't want to pay to re-record the piano and orchestra again."[3] In 2003, Boone admitted, "I had no freedom whatsoever. Joe told me exactly how to sing it and imitate every inflection from the original recording." in an interview with Entertainment Weekly Magazine.[5] Cisyk later retained a lawyer and sued Brooks for the fees she had earned for her work on the record and for credit on the soundtrack, which she later received.[3]
In 1977, Debby Boone, Pat Boone's daughter, recorded the song under the guidance of Curb Records executive Mike Curb[7] and songwriter Joseph Brooks.[5] Boone recorded her vocals over a pre-existing instrumental track that Brooks already had developed for the film's soundtrack.[7] The song was released as both a Warner-Curb Records single and as the title track to her first solo album, You Light Up My Life, which she released on Warner Bros. Records, Curb Records' parent label.
Cash Box said that "Ms. Boone builds it to a powerful emotional peak as a massive string section lends support."[8]
The single became the biggest single of the 1970s in the United States,[9] setting a new Billboard Hot 100 record for most weeks spent at number one. Elvis Presley's double-sided hit "Don't Be Cruel/Hound Dog", then recognized as the longest-running number one song of the rock era, spent eleven weeks atop the Billboard Best Sellers chart in 1956, before the 1958 debut of the Hot 100. The previous Hot 100 record was held by Bobby Darin's "Mack the Knife", Percy Faith's recording of "Theme from A Summer Place" (1960) and the Beatles' "Hey Jude" (1968), all three of which remained at No. 1 for nine weeks.[10] The ten-week record was matched in 1982 by Olivia Newton-John's "Physical",[11] but was not surpassed until a 1991 change in chart methodology allowed songs to achieve longer reigns at No. 1. In 1992, "End of the Road" by Boyz II Men would set the new record with 13 weeks.[12]
Besting her chart performance in Billboard, Boone's "You Light Up My Life" single topped Record World's Top 100 Singles Chart for an unbroken record of 13 weeks.[2] On Billboard's chart, Boone was unseated from No. 1 by the Bee Gees, with "How Deep Is Your Love", the first of three No. 1 singles from the Saturday Night Fever soundtrack. On Record World's chart, Boone kept the Bee Gees out of the number-one spot. In Cash Box magazine, "You Light Up My Life" managed only an eight-week stay at the top of the chart, before being dethroned by Crystal Gayle's "Don't It Make My Brown Eyes Blue". Its least-lengthy run was on the Radio and Records chart, with six weeks at No. 1 before relinquishing the spot to the Bee Gees;[13] it had knocked Carly Simon's "Nobody Does It Better" out of the top spot after only one week.
Decades after its release, the Debby Boone version is still considered one of the top ten Billboard Hot 100 songs of all time. In 2008, it was ranked at No. 7 on Billboard's "Hot 100 All-Time Top Songs" list (August 1958 - July 2008).[7] An updated version of the all-time list in 2013 ranked the song at No. 9.[15]
Although it was written by Brooks as a love song, the devout Boone interpreted it as inspirational and proclaimed that it was instead God who "lit up her life." This fact was later alluded to when the song appeared in The Simpsons episode "I Married Marge", Season 3, Episode 12.
LeAnn Rimes released her own version of "You Light Up My Life" as a single in 1997, 20 years after Boone's version was released, and on the same record label, the Warner Bros. Records label's Curb Records label. Her version fared modestly by comparison to the original at radio (No. 48 Country). However, her single was certified gold and was the title track to her No. 1 pop and country album, You Light Up My Life: Inspirational Songs.
The Irish pop band Westlife recorded a cover of the song and made it to their The Love Album album in 2006 which went straight to No. 1 in UK Albums Chart and performed it live subsequently.
A French rendering entitled "Tu remplis ma vie" was recorded by Anne Renée in 1977.
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