Question: What is the nationality of the singer who beat out Pour Some Sugar on Me by Def Leppard for the top spot on the US Billboard Hot 100 chart?

full_context: Document 1: Rocket (Def Leppard song): "Rocket" is a song recorded by English rock band Def Leppard in 1987 from the album "Hysteria". It was the sixth (seventh in the US) and final single release, coming out in January 1989 and hitting the Top 15 in the US Billboard Hot 100 and UK Singles Chart.
Document 2: Rick Springfield: Richard Lewis Springthorpe (born 23 August 1949) is an Australian singer, instrumentalist, songwriter, actor and author, known by his stage name Rick Springfield. He was a member of the pop rock group Zoot from 1969 to 1971, then started his solo career with his début single "Speak to the Sky" reaching the top 10 in Australia in mid-1972, when he moved to the United States. He had a No. 1 hit with "Jessie's Girl" in 1981 in both Australia and the U.S., for which he received the Grammy Award for Best Male Rock Vocal Performance. He followed with four more top 10 U.S. hits, "I've Done Everything for You", "Don't Talk to Strangers", "Affair of the Heart" and "Love Somebody". Springfield's two U.S. top 10 albums are "Working Class Dog" (1981) and "Success Hasn't Spoiled Me Yet" (1982).
Document 3: Simply Red: Simply Red are a British soul and pop band which formed in 1985 in Manchester. The lead singer of the band is the singer and songwriter Mick Hucknall, who, by the time the band was disbanded in 2010, was the only original member left. Since the release of their debut studio album "Picture Book" (1985), they have had ten songs reach top 10 in the UK Singles Chart, including "Holding Back the Years" and "If You Don't Know Me by Now", both of which reached number one on the US "Billboard" Hot 100. They have had five number one albums in the UK, with their 1991 album, "Stars", one of the best-selling albums in UK chart history.
Document 4: Love Bites (Def Leppard song): "Love Bites" is a power ballad recorded by the English rock band Def Leppard in 1987 on the album "Hysteria". It is Def Leppard's only number-one single on the "Billboard" Hot 100 to date.
Document 5: Pour Some Sugar on Me: "Pour Some Sugar on Me" is a song by the English rock band Def Leppard from their 1987 album "Hysteria". It reached number 2 on the US "Billboard" Hot 100 on 23 July 1988, behind "Hold On to the Nights" by Richard Marx. "Pour Some Sugar on Me" was ranked #2 on VH1's "100 Greatest Songs of the 80s" in 2006.
Document 6: Now and Forever (Richard Marx song): "Now and Forever" is a 1994 song written, produced and performed by American rock singer-songwriter Richard Marx. The song was also used in 1994 film "The Getaway" starring Kim Basinger and Alec Baldwin and directed by Roger Donaldson.
Document 7: Bitter Sweet Symphony: "Bitter Sweet Symphony" is a song by British alternative rock band The Verve, and is the lead track on their third studio album, "Urban Hymns" (1997). It is based on an Andrew Loog Oldham orchestral version of The Rolling Stones' song "The Last Time", from which it samples a main theme, and involved some legal controversy surrounding a plagiarism charge as a result. Consequently, Mick Jagger and Keith Richards were added to the songwriting credits. "Bitter Sweet Symphony" was released on 16 June 1997 by Hut Recordings as the first single from the album, reaching number two on the UK Singles Chart and stayed in the chart for three months. The song's momentum built slowly in the US throughout the latter months of 1997, ultimately leading to a CD single release on 3 March 1998 by Virgin Records America, helping the song to reach number 12 on the "Billboard" Hot 100.
Document 8: Corey Hart (singer): Corey Mitchell Hart (born May 31, 1962) is a Canadian singer, best known for his hit singles "Sunglasses at Night" and "Never Surrender". He has sold over 16 million records worldwide and scored nine US "Billboard" Top 40 hits. In Canada Hart has amassed 30 Top 40 hits, including 11 in the Top 10, over the course of 30 years in the music industry. Nominated for the Grammy Award for Best New Artist in 1984, Hart is an inductee of Canada's Walk of Fame and is also a multiple Juno award nominee and winner in Canada, including the Diamond Award for his best-selling album "Boy in the Box". He has also been honoured by the American Society of Composers, Authors and Publishers (ASCAP) and the Society of Composers, Authors and Music Publishers of Canada (SOCAN).
Document 9: Poison (American band): Poison is an American rock band that achieved great commercial success in the mid-1980s to the mid-1990s. Poison has sold over 40 million records worldwide and has sold 15 million records in the United States alone. The band has also charted ten singles to the Top 40 of the "Billboard" Hot 100, including six Top 10 singles and the Hot 100 number-one, "Every Rose Has Its Thorn". The band's breakthrough debut album, the multi-platinum "Look What the Cat Dragged In", was released in 1986 and they hit their peak with the second album, "Open Up and Say... Ahh!", which became the band's most successful album, being certified 5x platinum in the US. The popularity continued into the new decade with their third consecutive multi-platinum selling album, "Flesh & Blood".
Document 10: High 'n' Dry: High 'n' Dry is the second studio album by the English rock band Def Leppard, released on July 11, 1981. "High 'n' Dry" was Pete Willis' last full-time album with Def Leppard. It charted at No. 38 on the "Billboard" 200 and No. 26 on the UK Albums Chart. "High 'n' Dry (Saturday Night)", ranked No. 33 on VH1's 40 Greatest Metal Songs. Following the success of "Pyromania", the album re-entered in the US chart and reached No. 72 in 1983.
Document 11: You Shook Me All Night Long: "You Shook Me All Night Long" is a song by Australian hard rock band AC/DC, from the album "Back in Black". The song also reappeared on their later album "Who Made Who". It is AC/DC's first single to feature Brian Johnson as the lead singer and reached number 35 on the USA's Hot 100 pop singles chart in 1980. The single was re-released internationally in 1986, following the release of the album "Who Made Who". The re-released single in 1986 contains the B-side(s): B1. "She's Got Balls" (Live, Bondi Lifesaver '77); B2. "You Shook Me All Night Long" (Live '83 – 12-inch maxi-single only).
Document 12: Richard Marx: Richard Noel Marx (born September 16, 1963) is an American adult contemporary and pop/rock singer, songwriter, musician and record producer who has sold over 30 million records. He had a stream of hit singles in the late 1980s and 1990s, including "Endless Summer Nights," "Right Here Waiting," "Now and Forever," "Hazard" and "At the Beginning" with Donna Lewis. Although some of his major hit songs were ballads, many of his songs have had a classic rock style, such as "Don't Mean Nothing," "Should've Known Better," "Satisfied," and "Too Late to Say Goodbye."
Document 13: Barry Manilow: Barry Manilow (born Barry Alan Pincus; June 17, 1943) is an American singer-songwriter, arranger, musician, and producer with a career that has spanned more than 50 years. His hit recordings include "Mandy", "Can't Smile Without You", and "Copacabana (At the Copa)".
Document 14: Should've Known Better (Richard Marx song): "Should've Known Better" is a hit song written, composed, and performed by American rock singer Richard Marx, who released in September 1987 as the second single from his self-titled debut album. The song peaked at number three on the US Billboard Hot 100 as well as #7 on the Billboard Mainstream Rock Tracks chart in 1987 and #4 on the Radio & Records CHR/Pop Airplay chart.
Document 15: Donna Lewis: Donna Lewis is a British singer-songwriter and record producer from Cardiff, Wales. She is best known for the 1996 pop hit single "I Love You Always Forever", which peaked at number five on the UK Singles Chart, and also peaked within the top ten of the charts in Australia, Austria, Canada, France, Germany, New Zealand, Norway, and the United States. In the latter country, "I Love You Always Forever" peaked at number two on the "Billboard" Hot 100 for nine weeks, having been held off the summit by "Macarena" by Los Del Rio. It also became the highest-charting single on the "Billboard" Hot 100 by a Welsh artist since Bonnie Tyler topped the chart with Total Eclipse of the Heart in 1983. Additionally, the single holds the record for being drawn for third place among songs with the longest runs at number two on the "Billboard" Hot 100 and at second for most weeks at number one on the "Billboard" Mainstream Top 40 chart. Lewis teamed up with Richard Marx in the 1997 adult contemporary hit "At the Beginning." In 1997, Lewis was nominated for the Brit Award for Best British Female.
ground_truth: American