Question: Who sang the song which was before Loverboy on  the U.S. Billboard Hot 100?

Context paragraphs:
The Nitty Gritty Dirt Band (album): Nitty Gritty Dirt Band is the first album by the Nitty Gritty Dirt Band released in 1967.  The Nitty Gritty Dirt Band (aka The Dirt Band) is notable for having many charting albums and singles.  This album debuted on the U.S. Billboard Top Pop Albums on April 8, 1967, peaked at #161 and was on the charts for 8 weeks.  The single "Buy for Me the Rain" b/w "Candy Man" debuted on the U.S. Billboard Hot 100 on 4/8/67, peaked at #45 on 5/6/67, and was on the charts for 7 weeks.

Love of a Woman: "Love of a Woman" is a song written by Kevin Brandt, and recorded by American country music artist Travis Tritt.  It was released in June 2001 as the third single from his album "Down the Road I Go".  It peaked at number 2 on the U.S. Billboard Hot Country Singles & Tracks, as did Travis Tritt's previous single "It's a Great Day to Be Alive".  It also peaked at number 39 on the U.S. "Billboard" Hot 100.

Get Me Home (song): "Get Me Home" is the first single from Foxy Brown's debut album Ill Na Na.  The song peaked at number 42 on the U.S. Billboard Hot 100 charts and number 10 on the U.S. Billboard R&B charts.

Fire and Ice (Pat Benatar song): "Fire and Ice" was the lead single off Pat Benatar's third album, "Precious Time".  Released July 6, 1981, the track was written by Pat Benatar, Tom Kelly, and Scott Sheets.  It peaked at #17 on the U.S. Billboard Hot 100 and peaked at #2 on the U.S. Mainstream billboard.  The song also won Benatar her second Grammy award for Best Female Rock Rock Performance in 1982.

Careless Whisper: "Careless Whisper" is a song by English singer-songwriter George Michael (sometimes credited to "Wham!  featuring George Michael" in Japan, Canada and the United States).  It was released on 24 July 1984, by Epic Records in the United Kingdom, Japan and other countries, and by Columbia Records in North America.  The song was George Michael's first solo single, although he was still performing in Wham!  at the time (the song is included on Wham! 's album "Make It Big").

Got to Get It (Sisqó song): "Got to Get It" is the debut single by Sisqó of Dru Hill featuring Make It Hot.  It is the first single from Sisqó's debut solo album, "Unleash the Dragon".  The single was fairly successful on the charts.  It peaked at #40 on the U.S. Billboard Hot 100 chart and #12 on the U.S. Billboard Hot R&B/Hip-Hop Singles & Tracks chart.  The music video for the song was directed by Hype Williams and features Sisqó singing the song on top of a building then goes straight to Make It Hot’s performance with clips of Sisqó playing a guitar.  The video ends with Sisqó dancing with females.

Causa y Efecto: "Causa y Efecto " (English: Cause and Effect ) is a song performed by Mexican singer Paulina Rubio.  The song was recorded for her ninth studio album Gran City Pop, and was released as the lead single on March 30, 2009.  Causa y Efecto became a hit reaching number 1 in the U.S. Billboard Hot Latin Songs and Hot Latin Airplays.  Causa y Efecto was produced by Cachorro López and written by Mario Domm and Mónica Vélez.  "Causa y Efecto" is Rubio's first number one single in the Billboard Hot Latin Songs since Ni Una Sola Palabra in 2006.  "Causa y Efecto" was awarded "Song of the year pop/ballad" by ASCAP.

She Drives Me Crazy: "She Drives Me Crazy" is a song recorded by English group Fine Young Cannibals, included on their 1989 album "The Raw & the Cooked".  The song peaked at Number 5 on the British singles chart in the band's native U.K. in January 1989 (it was released on New Year's Day) before hitting Number 1 on the "Billboard" Hot 100 in the US on 15 April 1989.  "She Drives Me Crazy" also topped the charts in Australia, Canada, Spain and on the U.S. Billboard Hot Dance Music/Club Play Singles chart.  It also was a top 3 hit on the German and Dutch Top 40.

Lovin' Every Minute of It (song): "Lovin' Every Minute of It" is a song released in 1985 on the Canadian rock band Loverboy's album of the same title.  The song reached #9 on the U.S. Billboard Hot 100 when released as a single later that year.  It was written by Robert John "Mutt" Lange.  In Canada, the song peaked at #11.

Loverboy (Billy Ocean song): "Loverboy" was Billy Ocean's second single from his 1984 album, "Suddenly".  It was produced by Keith Diamond and reached a chart high of number 2 on the U.S. Billboard Hot 100 (behind "Careless Whisper" by Wham!  featuring George Michael) as well as hitting number 20 on the soul chart, and number 15 on the UK Singles Chart in February 1985.  It also reached the top spot of the Hot Dance Music/Club Play chart in the U.S., in an extended version.  The track was released on the Jive label under the catalogue reference, JIVE 80.  This song was played in the 1st episode of the BBC One's British medical soap Casualty back on 6th September 1986.

Supporting paragraphs: Loverboy (Billy Ocean song) Careless Whisper
Answer: George Michael