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?

Context articles: High 'n' Dry
Promises (Def Leppard song)
Ho Hey
Richard Marx
Have You Ever Needed Someone So Bad
Love Bites (Def Leppard song)
The Mamas &amp; the Papas (album)
Rocket (Def Leppard song)
Murphy's Law (song)
Pour Some Sugar on Me

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.
"Promises" is a 1999 song by British hard rock band Def Leppard from their album "Euphoria".
 It was released as a single later that year and reached No. 1 on the "Billboard" Hot Mainstream Rock Tracks chart and No. 38 on the Top 40 Mainstream.
 The song was also featured on the second discs of their compilations "Best of Def Leppard" and "", released in 2004 and 2005.
 A live version is featured on their live album "Viva!
 Hysteria", released in October 2013.
"Ho Hey" is a song by American folk rock band the Lumineers.
 It was released on June 4, 2012, as the lead single from their debut self-titled studio album.
 The music video was released on March 11, 2012.
 "Ho Hey" reached number one for 18 non-consecutive weeks on the "Billboard" Rock Songs chart, as well as two weeks in the top spot on the "Billboard" Alternative Songs chart and eight weeks in the top spot on the Adult Pop Songs chart, and reached number 3 on the "Billboard" Hot 100 chart, becoming their first single to do so, as well as their first top 5 single.
 It is also their first single to be certified in the US.
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."
"Have You Ever Needed Someone So Bad" is a 1992 single by British hard rock band Def Leppard from their multi-platinum album "Adrenalize".
 In the United States, the song reached #7 on the Mainstream Rock charts, and #12 on the "Billboard" Hot 100.
 The Acoustic Hippies from Hell, credited on the B-side tracks, was the name used by Def Leppard and the Hothouse Flowers performing together.
"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.
The Mamas & the Papas is the self-titled second studio album by The Mamas & the Papas, released in 1966.
 The album peaked at number 4 on the US Billboard 200 album chart and number 24 in the UK.
 The lead off single, "I Saw Her Again", reached number 5 on the US Billboard Hot 100 chart and number 11 in the UK Singles Chart. "
Words of Love" was released as the second single in the US peaking at number 5.
 In the UK, it was released as a double A-side with "Dancing in the Street" (a cover of the 1964 hit by Martha and the Vandellas) and charted at number 47 in the UK.
"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.
"Murphy's Law," was the name of a number 1 Billboard Hot Dance Club Play Chart single by the Canadian/American female dance music duo Chéri.
 It reached the top spot in May 1982 and stayed there for three weeks.
 The single also reached number 5 on the soul chart, reached the UK top twenty (#13), and entered the Billboard Hot 100 chart, where it peaked at number 39.
"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.