Question: Who has been a solo music artist Chad Kroeger or Justin Timberlake?
Context: Chad Robert Turton (born November 15, 1974), known professionally by his mother's maiden name of Kroeger, is a Canadian musician and producer, best known as the lead vocalist and guitarist for the Canadian rock band Nickelback.  In addition to his work with Nickelback, Kroeger has been involved with a variety of collaborations, appearing as a guest musician in several songs and has contributed in both production and songwriting.  He has co-written several songs for other artists and for films. American singer-songwriter Justin Timberlake has written and recorded material for his four studio albums.  Timberlake released his solo debut studio album, "Justified", in November 2002.  Most of the record was produced by The Neptunes, with additional collaborators including Brian McKnight, Scott Storch, Timbaland, and The Underdogs. " Like I Love You", written by Timberlake, Chad Hugo and Pharrell Williams. " Cry Me a River", produced by Timbaland, is a R&B song about a brokenhearted man who moves on from his past.  A "Rolling Stone" reviewer called the song a "breakup aria."  Timberlake, Hugo and Williams also wrote "Rock Your Body" and "Señorita". Chad Brock is the eponymous debut studio album of country music artist Chad Brock.  Released in 1998 (see 1998 in country music) on Warner Bros.  Records Nashville, the album produced three chart singles for Brock on the "Billboard" country charts between 1998 and 1999.  In order of release, these were "Evangeline" (#51), "Ordinary Life" (#3) and "Lightning Does the Work" (#19).  "Evangeline" was covered by Sammy Kershaw on his 2006 album "Honky Tonk Boots", which was also produced by Buddy Cannon and Norro Wilson.  "You Made a Liar Out of Me" was co-written by Rich Alves of Pirates of the Mississippi. "Like I Love You" is the debut single recorded by American singer Justin Timberlake for his debut studio album, "Justified" (2002).  The song features American hip hop duo Clipse.  It was co-written by Timberlake and The Neptunes (Chad Hugo and Pharrell Williams), who also produced it.  The song was released on October 14, 2002 as Timberlake's debut solo single, following the break-up of 'NSYNC earlier that year.  According to Williams, who came up with the music loop, the song's drums were an ode to the funk era. "Dead and Gone" is a song by American hip hop recording artist T.I., featuring American singer-songwriter Justin Timberlake.  It was released as the eighth single from T.I.'s sixth studio album, "Paper Trail" (2008).  Due to the high number of digital downloads upon the album's release, the song debuted on the "Billboard" Hot 100 before its official single release.  The song marked the second collaboration between T.I. and Justin Timberlake, the first being the hit single "My Love", from Timberlake's second album, "FutureSex/LoveSounds" (2006).  T.I. and Timberlake performed this song at the 51st Grammy Awards.  The song was later nominated twice at the 52nd Grammy Awards, for Best Rap/Sung Collaboration and Best Rap Song.  It was the 10th bestselling digital single of 2009 in the United States.  As of 2012, it had sold 3.1 million copies in the country. The discography of Nickelback, a Canadian rock band, consists of nine studio albums, two compilation albums, one extended play (EP), 43 singles, five video albums, and 32 music videos. Formed in Hanna, Alberta in 1995, Nickelback was originally composed of vocalist and guitarist Chad Kroeger, guitarist and backing vocalist Ryan Peake, bassist Mike Kroeger and drummer Brandon Kroeger.  The band self-released its debut EP "Hesher" and debut full-length album "Curb" in 1996, and later signed with Roadrunner Records and released "The State" in 1999.  Ryan Vikedal replaced Brandon Kroeger in 1998, after the band spent a brief time with Mitch Guindon on drums.  "The State" reached number 130 on the US "Billboard" 200 upon its international release in 2000, and "Curb" reached number 182 on the chart when it was reissued by Roadrunner in 2002.  Three singles from "The State" reached the US Mainstream Rock top 40, including the top ten releases "Leader of Men" and "Breathe". Justin Randall Timberlake (born January 31, 1981) is an American singer-songwriter, actor and record producer.  Born and raised in Tennessee, he appeared on the television shows "Star Search" and "The All-New Mickey Mouse Club" as a child.  In the late 1990s, Timberlake rose to prominence as one of the two lead vocalists and youngest member of NSYNC, which eventually became one of the best-selling boy bands of all time.  Timberlake began to adopt a more mature image as an artist with the release of his debut solo album, the R&B-focused "Justified" (2002), which yielded the successful singles "Cry Me a River" and "Rock Your Body", and earned his first two Grammy Awards. "Hero" is a song recorded by Chad Kroeger (lead vocalist of Nickelback) and Josey Scott (then lead vocalist of Saliva) for the soundtrack to the 2002 film "Spider-Man".  It was written by Kroeger, Scott, and Tyler Connolly and recorded specifically for the film.  "Hero" was released through Roadrunner Records on March 1, 2002 as the soundtrack's lead single.  The song serves as Kroeger's debut solo release. "It's a Business Doing Pleasure with You" is a song written by Nickelback frontman Chad Kroeger and country musician Brett James, and performed by American country music artist Tim McGraw.  The song is the first single to his tenth studio album, "Southern Voice".  It is also McGraw's fifty-second chart entry on the "Billboard" country charts.  The song was released to radio on June 29, 2009. Avril Lavigne is the fifth studio album by Canadian singer-songwriter Avril Lavigne.  It was released on 1 November 2013 by Sony Music Entertainment.  The album is a follow-up to her 2011 effort "Goodbye Lullaby" and was developed shortly after its release.  Lavigne collaborated with numerous producers including Martin Johnson, Peter Svensson, David Hodges, Matt Squire and her then-partner Chad Kroeger.  In both musical and lyrical aspects, the album represents a departure from the acoustic-oriented production of her previous album "Goodbye Lullaby", featuring a more pop and upbeat sound juxtaposed with power and piano ballads.  "Avril Lavigne" also incorporates electronic music, industrial and punk rock.  The album features two vocal collaborations: Kroeger and American industrial metal singer Marilyn Manson.  This was her first and only album through Epic.
Answer: Justin Randall Timberlake