Question: Who was the leader of the band that performed a top-five hit in both the USA and UK in 1979?

Context articles: Don't Tread on Me (311 song)
What's a Woman?
The War Song
Boat on the River
Back to the Egg
Not Fair
Daytime Nighttime Suffering
Jean Shepard discography
Hey You (311 song)
It's a Miracle (Culture Club song)

"Don't Tread on Me" is the first single by the group 311 from their album of the same name.
 The single, an original composition written by the band's members, was released in 2005.
 It became their seventh top-five hit on the Billboard Alternative Songs chart.
"What's a Woman?"
 is a 1990 pop-rock song recorded by Belgian band Vaya Con Dios.
 It was the second single from band's second studio album "Night Owls" and was released in 1990.
 It achieved success in many European countries.
 It even topped the chart in the Netherlands, and was a top-five hit for three weeks in France.
 To date it is Vaya Con Dios' most successful song.
"The War Song" is a 1984 song by the British band Culture Club which features background vocals by Clare Torry.
 It was the lead single from the band's third album "Waking Up with the House on Fire".
 The song became the group's seventh top-five hit on the UK Singles Chart, peaking at number two.
 In the U.S. the single peaked at #17 on the "Billboard" Hot 100 and hit the top ten in many countries including Canada (#7), Ireland (#1), Italy (#3) and Australia (#2).
 While very popular at the time, it was not appreciated by some music critics for some weakness in the lyrics and less original arrangements.
"Boat on the River" is a 1979 song by Styx, from their album "Cornerstone".
 It was released as a single in 1980, but did not chart in the band's native United States.
 However, it was popular in several German-speaking countries, becoming a top-five hit on the German, Austrian and Swiss charts (reaching number one on the latter.)
Back to the Egg is the seventh and final studio album by the British-American band Wings, released in 1979 on Columbia Records in America, and on Parlophone in the UK.
 Co-produced by Chris Thomas, the album reflects band leader Paul McCartney's embracing of contemporary musical trends such as new wave and punk, and marked the arrival of new Wings members Laurence Juber and Steve Holley.
 "Back to the Egg" adopts a loose conceptual theme around the idea of a working band, and its creation coincided with a period of considerable activity for the group, which included making a return to touring and work on several television and film projects.
"Not Fair" is a song by British recording artist Lily Allen from her second studio album, "It's Not Me, It's You" (2009).
 Written by Allen and produced by Greg Kurstin, the song was released as the second single from the album on 19 February 2009 by Regal Recordings.
 The song incorporates country music as the lyrics depict sexual frustration.
 Contemporary critics did not positively receive the song and its theme, some calling it a "pseudo country track" and considering it a strange musical composition.
 The single peaked in the top 20 of the charts of some European countries and Australia, while scoring Allen's second consecutive top-five hit on both the UK Singles Chart and the Dutch Top 40 (since in the latter "Fuck You" was a commercial success before "Not Fair").
"Daytime Nighttime Suffering" is a song written by Paul McCartney and recorded by Wings.
 It was the B-side to the 1979 single "Goodnight Tonight," which was a top-five hit in both the UK and USA.
 It was released on CD in 1993 as part of the release of "The Paul McCartney Collection", and can be found as a bonus track on the album "Back to the Egg".
 It is also included on the CD collection "".
American country artist Jean Shepard released twenty-five studio albums, fifteen compilation albums, one live album, seventy-one singles, two charting B-sides, and appeared on nine albums.
 Signing in 1952 with Capitol Records, her second single "A Dear John Letter" (a 1953 duet with Ferlin Husky) became a breakthrough hit.
 It topped the "Billboard" Hot Country Songs for six weeks and reached the Billboard Hot 100's fourth position.
 Shepard's solo career became successful in 1955 with the release several singles, including the top-five hits "A Satisfied Mind" and "Beautiful Lies".
 Shepard's debut studio album "Songs of a Love Affair" (1956) was the first country music "concept album" to be issued.
 She was commercially unsuccessful until a major comeback in 1964 with the top-five hit "Second Fiddle (To an Old Guitar)" and the studio album "Lighthearted and Blue".
 The latter was her first to reach the Top Country Albums list.
 A series of hit singles continued for Shepard, such as "Many Happy Hangovers to You", "I'll Take the Dog", "If Teardrops Were Silver", and "Then He Touched Me".
 Accompanying albums reached the major positions on the country albums chart, including "Many Happy Hangovers", "Heart We Did All That We Could", and "Best by Request".
"Hey You" is a song written and recorded by American rock band 311.
 It is the first single from the group's ninth studio album, "Uplifter".
 The single was released through Volcano Entertainment on April 10, 2009.
 It was received generally well and became their eighth top-five hit on the "Billboard" Alternative Songs chart.
"It's a Miracle", was the fifth and final single from new wave band Culture Club's 1983 "Colour by Numbers" album.
 The song became the group's sixth top-five hit on the UK Singles Chart, peaking at number four.
 It reached number thirteen on the "Billboard" Hot 100.
 and hit the top five in Canada.
 It was the band's first US release to miss the Top 10; however, the song still received considerable airplay there during the summer of 1984.