Background: Curved Air are a pioneering English progressive rock group formed in 1970 by musicians from mixed artistic backgrounds, including classical, folk, and electronic sound. The resulting sound of the band was a mixture of progressive rock, folk rock, and fusion with classical elements. Along with High Tide and East of Eden, Curved Air were one of the first rock bands after It's a Beautiful Day and the United States of America to feature a violin. Curved Air released eight studio albums, the first three of which broke the UK Top 20, and had a hit single with "Back Street Luv" (1971) which reached number 4 in the UK Singles Chart.
Context: Having retained a good working relationship, Sonja Kristina and Mike Wedgwood formed a new band with Kirby Gregory (electric guitar), Eddie Jobson (keyboards, violin), and Jim Russell (drums). Jobson had come from a band called Fat Grapple, who had been one of Curved Air's support acts on tour. This new band played a much more conventional brand of rock than the former Curved Air, with almost none of the classical influences of that group. However, on the suggestion of manager Clifford Davis, they continued using the name Curved Air so as to give them a commercial leg up. Kristina later commented: What I wanted to do with the band at the time was get more of a rock edge to it, and Kirby's guitar playing really excited me - he was just really wild. And Jim was the same way, a very solid rock drummer. Mike and I really wanted to continue, and it was our manager Clifford Davis who said we would do a better business continuing to call the band Curved Air. So we kept the name and followed along the same pattern as before, as a writer's band. Everybody in the new band contributed material except for Jim Russell, who really wasn't a writer. Before it had mainly been Darryl and Francis, but I had managed to get some of my compositions in. The use of the Curved Air name was not enough, however. Whereas all three of the original Curved Air's albums had broken the UK top 20, the new band's sole album, Air Cut, failed to even chart. Due to artistic differences with Jobson, Kirby Gregory and Jim Russell both left the group to form Stretch. Warner Brothers realized that the current Curved Air was in essence not the same band they had signed, and so the remaining trio recorded a demo tape for the label. The demos failed to convince Warner Brothers, and they discontinued the contract. (These demos were later issued as part of the Lovechild record.) With no contract and only half a lineup, in summer 1973 Curved Air broke up. Jobson replaced Eno in Roxy Music, while Wedgwood joined Caravan.
Question: Were either of them the lead singer?
Answer:

Background: Deborah Anne "Debby" Boone (born September 22, 1956), is an American singer, author, and actress. She is best known for her 1977 hit, "You Light Up My Life", which spent ten weeks at No. 1 on the Billboard Hot 100 chart and led to her winning the Grammy Award for Best New Artist the following year. Boone later focused her music career on country music resulting in the 1980 No. 1 country hit "Are You on the Road to Lovin' Me Again". In the 1980s, she recorded Christian music which garnered her four top 10 Contemporary Christian albums as well as two more Grammys.
Context: With her older sisters married and younger sister Laury in college, Boone was actively encouraged by producer Mike Curb to launch a solo career. Boone released her first solo effort, "You Light Up My Life" (which had been featured in the film of the same name) in 1977. The song became the biggest hit of the 1970s spending ten consecutive weeks at No. 1 on the Billboard Hot 100 -- longer than any other song in Hot 100 history to that point. (In 2008, Billboard ranked the song No. 7 among all songs that charted in the 50-year history of the Hot 100.) The song earned Boone a Grammy Award for Best New Artist and an American Music Award for Favorite Pop Single of 1977. She also received Grammy nominations for Best Pop Vocal Performance - Female and Record of the Year won by, respectively, Barbra Streisand ("Love Theme From "A Star Is Born" (Evergreen)") and the Eagles ("Hotel California"). "You Light Up My Life" also succeeded on Billboard's Adult Contemporary (No. 1 for one week) and Country (No. 4) singles charts. The single and the album (No. 6 Pop, No. 6 Country) of the same name were both certified platinum. The song, written and produced by Joe Brooks, was from the film of the same name. Brooks earned Song of the Year awards at both the 1978 Grammys and Oscars for writing the song. (Boone performed the song at both awards shows.) Boone's version was not used in the movie or featured on its soundtrack. The song was lip-synched in the film by its star, Didi Conn, performing to vocals recorded by Kacey Cisyk. It was written as a love song, but Boone interpreted the song as inspirational and stated that she recorded the song for God. Boone's overnight success led to a tour with her father and frequent television appearances, but she was unable to maintain her success in pop music after "You Light Up My Life". Her follow-up single, "California" (also written and produced by Joe Brooks), peaked at No. 50 Pop and No. 20 AC. "California" was included on Boone's second album, Midstream, which faltered at No. 147 Pop. Her next single, the double-sided "God Knows"/"Baby I'm Yours", also struggled, peaking at No. 74 Pop, becoming her last entry on the Hot 100. However, the single charted AC (No. 14) and returned Boone to the country chart (No. 22). Boone then released another movie theme, "When You're Loved", from The Magic of Lassie. Like "You Light Up My Life", the song was nominated for an Academy Award for its composers, the Sherman Brothers, but it failed to replicate the success of her first single charting only No. 48 AC. Boone's wholesome persona contrasted with the image-conscious pop-music industry, leading her career in different musical directions.
Question: what was "you light up my life"?
Answer:
The song became the biggest hit of the 1970s