Question: The performer of Just Go was a guest judge on which season of American Idol?

full_context: Document 1: Just the Way You Are (Bruno Mars song): ``Just the Way You Are ''Single by Bruno Mars from the album Doo - Wops & Hooligans Released July 20, 2010 Format CD single digital download Genre Pop R&B Length 3: 41 Label Elektra Atlantic Songwriter (s) Bruno Mars Philip Lawrence Ari Levine Khalil Walton Khari Cain Producer (s) The Smeezingtons Needlz Bruno Mars singles chronology`` Billionaire'' (2010) ``Just the Way You Are ''(2010)`` Grenade'' (2010) ``Billionaire ''(2010)`` Just the Way You Are'' (2010) ``Grenade ''(2010)
Document 2: American Idol: American Idol employs a panel of judges who critique the contestants' performances. The original judges were record producer and music manager Randy Jackson, pop singer and choreographer Paula Abdul and music executive and manager Simon Cowell. The judging panel for the most recent season consisted of country singer Keith Urban, singer and actress Jennifer Lopez, and jazz singer Harry Connick, Jr. The show was originally hosted by radio personality Ryan Seacrest and comedian Brian Dunkleman, with Seacrest continuing on for the rest of the seasons.
Document 3: American Idol: The show had originally planned on having four judges following the Pop Idol format; however, only three judges had been found by the time of the audition round in the first season, namely Randy Jackson, Paula Abdul and Simon Cowell. A fourth judge, radio DJ Stryker, was originally chosen but he dropped out citing "image concerns". In the second season, New York radio personality Angie Martinez had been hired as a fourth judge but withdrew only after a few days of auditions due to not being comfortable with giving out criticism. The show decided to continue with the three judges format until season eight. All three original judges stayed on the judging panel for eight seasons.
Document 4: Truly (song): "Truly" is the title of the debut solo single by singer-songwriter Lionel Richie. Resuming where he left off with D-flat major tunes "Sail On" and particularly "Still" when he was lead for the Commodores, Richie wrote the song and co-produced it with James Anthony Carmichael.
Document 5: American Idol: The fourteenth season premiered on January 7, 2015. Ryan Seacrest returned to host, while Jennifer Lopez, Keith Urban and Harry Connick, Jr. returned for their respective fourth, third and second seasons as judges. Eighth season runner-up Adam Lambert filled in for Urban during the New York City auditions. Randy Jackson did not return as the in-house mentor for this season.
Document 6: American Idol: With the exception of seasons one and two, the contestants in the semifinals onwards perform in front of a studio audience. They perform with a full band in the finals. From season four to season nine, the American Idol band was led by Rickey Minor; from season ten onwards, Ray Chew. Assistance may also be given by vocal coaches and song arrangers, such as Michael Orland and Debra Byrd to contestants behind the scene. Starting with season seven, contestants may perform with a musical instrument from the Hollywood rounds onwards. In the first nine seasons, performances were usually aired live on Tuesday nights, followed by the results shows on Wednesdays in the United States and Canada, but moved to Wednesdays and Thursdays in season ten.
Document 7: American Idol: In season eight, Latin Grammy Award-nominated singer–songwriter and record producer Kara DioGuardi was added as a fourth judge. She stayed for two seasons and left the show before season ten. Paula Abdul left the show before season nine after failing to agree terms with the show producers. Emmy Award-winning talk show host Ellen DeGeneres replaced Paula Abdul for that season, but left after just one season. On January 11, 2010, Simon Cowell announced that he was leaving the show to pursue introducing the American version of his show The X Factor to the USA for 2011. Jennifer Lopez and Steven Tyler joined the judging panel in season ten, but both left after two seasons. They were replaced by three new judges, Mariah Carey, Nicki Minaj and Keith Urban, who joined Randy Jackson in season 12. However both Carey and Minaj left after one season, and Randy Jackson also announced that he would depart the show after twelve seasons as a judge but would return as a mentor. Urban is the only judge from season 12 to return in season 13. He was joined by previous judge Jennifer Lopez and former mentor Harry Connick, Jr.. Lopez, Urban and Connick, Jr. all returned as judges for the show's fourteenth and fifteenth seasons.
Document 8: Encore (Lionel Richie album): Encore is the first live album by Lionel Richie, released on November 26, 2002. Various international versions also included "Goodbye", "To Love a Woman" (featuring Enrique Iglesias), "Don't Stop the Music" and "Tender Heart". The material on the album was recorded at Wembley Arena in London, England in May 2001.
Document 9: American Idol: Once in Hollywood, the contestants perform individually or in groups in a series of rounds. Until season ten, there were usually three rounds of eliminations in Hollywood. In the first round the contestants emerged in groups but performed individually. For the next round, the contestants put themselves in small groups and perform a song together. In the final round, the contestants perform solo with a song of their choice a cappella or accompanied by a band‍—‌depending on the season. In seasons two and three, contestants were also asked to write original lyrics or melody in an additional round after the first round. In season seven, the group round was eliminated and contestants may, after a first solo performance and on judges approval, skip a second solo round and move directly to the final Hollywood round. In season twelve, the executive producers split up the females and males and chose the members to form the groups in the group round.
Document 10: Just Go (Lionel Richie song): "Just Go" is a single by Lionel Richie from his 2009 album "Just Go". The song, a duet with Akon, was released on March 12, 2009 and - following its UK release - was described by noted R&B writer Pete Lewis of the award-winning 'Blues & Soul' as "a seductively tuneful single with a Caribbean-tinged lilt".
Document 11: Just in Love: "Just in Love" is a song performed by the American singer Joe Jonas. The song was released on September 11, 2011 by Hollywood Records, as the second and final single from his debut album, "Fastlife" (2011). The song was written by Jonas and James Fauntleroy and produced by Rob Knox. The song garnered mixed reception from music critics. An official remix of the track features a verse from American rapper Lil Wayne and slightly altered production; it received a Parental Advisory sticker for this because of the explicit lyrics Lil Wayne raps.
Document 12: American Idol: Beginning in the tenth season[citation needed], permanent mentors were brought in during the live shows to help guide the contestants with their song choice and performance. Jimmy Iovine was the mentor in the tenth through twelfth seasons, former judge Randy Jackson was the mentor for the thirteenth season and Scott Borchetta was the mentor for the fourteenth and fifteenth season. The mentors regularly bring in guest mentors to aid them, including Akon, Alicia Keys, Lady Gaga, and current judge Harry Connick, Jr..
Document 13: My Destiny (Lionel Richie song): "My Destiny" is a 1992 song recorded by Lionel Richie. It was the second single from his album "Back to Front" and was released in 1992. The song achieved some success, and it even topped the Dutch Mega Single Top 100. The song also appeared on Richie's best of "" and "The Definitive Collection".
Document 14: Stuck on You (Lionel Richie song): "Stuck on You" is a song written by and originally recorded by Lionel Richie. It was the fourth single released from his second studio album "Can't Slow Down" released on May 1, 1984, by Motown, and achieved chart success, particularly in the U.S. and the UK, where it peaked at number three and number 12, respectively. The song differs from Richie's other compositions, as it displays a country pop influence rather than R&B. As such, the single's cover photo shows Richie wearing a cowboy hat, and indeed, "Stuck on You" peaked at number 24 on the country chart. "Stuck on You" reached number one on the Adult Contemporary chart, Richie's seventh chart topper. The song marks Lionel Richie's country music debut.
Document 15: American Idol: Guest judges may occasionally be introduced. In season two, guest judges such as Lionel Richie and Robin Gibb were used, and in season three Donna Summer, Quentin Tarantino and some of the mentors also joined as judges to critique the performances in the final rounds. Guest judges were used in the audition rounds for seasons four, six, nine, and fourteen such as Gene Simmons and LL Cool J in season four, Jewel and Olivia Newton-John in season six, Shania Twain in season eight, Neil Patrick Harris, Avril Lavigne and Katy Perry in season nine, and season eight runner-up, Adam Lambert, in season fourteen.
ground_truth: season two
sub_queries: Just Go >> performer Answer: Lionel Richie
In what season was Lionel Richie a guest judge on American Idol? Answer: season two