Question: Which American singer was part of the Citizen Change political service group and spent a record sixteen weeks atop the "Billboard" Hot 100.

American-Canadian singer Robin Thicke has released seven studio albums, twenty-six singles and twenty music videos.  Thicke signed his first recording contract with Interscope Records as a teenager and found success as a songwriter, before he began concentrating on his career as a performer.  In 2000, Thicke started recording his debut album, "A Beautiful World", which was released in April 2003.  The album debuted at number 152 on the US "Billboard" 200, selling 119,000 copies.  The record also peaked at number 36 on the Mega Album Top 100 in the Netherlands.  Two singles were released from the album; the first, "When I Get You Alone" became a top ten hit in the Netherlands and New Zealand.  That single also peaked at number 17 in Australia and was certified gold by the Australian Recording Industry Association (ARIA).  In 2006, Thicke released his second studio album "The Evolution of Robin Thicke".  The record debuted at number 5 on the US "Billboard" 200, topped it on the "Billboard"'s Top R&B/Hip-Hop Albums, and became a certified platinum by the Recording Industry Association of America (RIAA).  The album also charted in France, the Netherlands, and the United Kingdom.  "The Evolution of Robin Thicke" produced four singles, all of which charted on the "Billboard"'s Hot R&B/Hip-Hop Songs. " Lost Without U" became one of his biggest hits, peaking at number 14 on the US "Billboard" Hot 100 and spending 11 weeks atop the "Billboard"'s Hot R&B/Hip-Hop Songs. <SEP>  Carey and Boyz II Men spent a record sixteen weeks atop the "Billboard" Hot 100 in 1995–1996 with "One Sweet Day," which remains the longest-running number-one song in US chart history. Mariah Carey (born March 27, 1969 or 1970) is an American singer, songwriter, record producer, and actress.  In 1990, she rose to fame with the release of "Vision of Love" from her eponymous debut album.  The album produced four chart-topping singles in the US and began what would become a string of commercially successful albums which solidified the singer as Columbia Records' highest selling act.  Following a contentious divorce from Sony Music head Tommy Mottola, Carey adopted a new image and traversed towards hip hop with the release of "Butterfly" (1997).  In 1998, she was honored as the world's best-selling recording artist of the 1990s at the World Music Awards and subsequently named the best-selling female artist of the millennium in 2000. <SEP> "How Deep Is Your Love" is a pop ballad written and recorded by the Bee Gees in 1977 and released as a single in September.  It was ultimately used as part of the soundtrack to the film "Saturday Night Fever".  It was a number three hit in the United Kingdom and Australia.  In the United States, it topped the "Billboard" Hot 100 on 24 December 1977 (becoming the first of six consecutive US number-one hits), ended the 10-week reign of Debby Boone's "You Light Up My Life" and stayed in the Top 10 for a then-record 17 weeks.  The single spent six weeks atop the US adult contemporary chart.  It is listed at number 22 on the 55th anniversary edition of "Billboard's All Time Top 100".  Alongside "Stayin' Alive" and "Night Fever", it is one of the group's three tracks on the list.  The song was covered by Take That for their 1996 "Greatest Hits" album, reaching number-one on the UK Singles Chart for three weeks. <SEP>  The stated aim was to get young people to vote. Citizen Change is a political service group, founded by musician P. Diddy, and backed by Mary J. Blige, Mariah Carey and 50 Cent.