Question: What month did the performer of Sober win American Idol?

full_context: Document 1: American Idol: Ruben Studdard emerged as the winner, beating Clay Aiken by a small margin. Out of a total of 24 million votes, Studdard finished just 134,000 votes ahead of Aiken. This slim margin of victory was controversial due to the large number of calls that failed to get through. In an interview prior to season five, executive producer Nigel Lythgoe indicated that Aiken had led the fan voting from the wildcard week onward until the finale.
Document 2: American Idol: In the May 23 season finale, Jordin Sparks was declared the winner with the runner-up being Blake Lewis. Sparks has had some success as a recording artist post-Idol.
Document 3: One Minute: "One Minute" is a song recorded by American recording artist Kelly Clarkson taken from her third studio album, "My December" (2007). The song served as the album's second single in Australia on September 18, 2007 through 19 Recordings and RCA Records. Clarkson originally wrote it for her second studio album, "Breakaway" (2004), with songwriters Kara DioGuardi, Chantal Kreviazuk and Raine Maida; however, it did not make the final track listing. It was then reworked for "My December", being produced by David Kahne, and co-produced by Jason Halbert and Jimmy Messer. "One Minute" is an alternative rock song with electropop influences, and consists of "rapid-fire give-and-take verses."
Document 4: Sober (Kelly Clarkson song): "Sober" is a song recorded by American recording artist Kelly Clarkson taken from her third studio album, "My December" (2007). The song served as the album's second single on July 10, 2007 through 19 Recordings and RCA Records. Clarkson wrote it after her friend Calamity McEntire, who receives a songwriting credit, gave her the line "pick her weeds and keep the flowers", with additional writing by Aben Eubanks and Jimmy Messer, production by David Kahne, and co-production by Messer and Jason Halbert. "Sober" is an alternative rock song, with lyrics that use addiction as a metaphor for a relationship, evolving around the line "Three months and I'm still sober".
Document 5: American Idol: In what was to become a tradition, Clarkson performed the coronation song during the finale, and released the song immediately after the season ended. The single, "A Moment Like This", went on to break a 38-year-old record held by The Beatles for the biggest leap to number one on the Billboard Hot 100. Guarini did not release any song immediately after the show and remains the only runner-up not to do so. Both Clarkson and Guarini made a musical film, From Justin to Kelly, which was released in 2003 but was widely panned. Clarkson has since become the most successful Idol contestant internationally, with worldwide album sales of more than 23 million.
Document 6: Already Gone (Kelly Clarkson song): "Already Gone" is a song performed by American pop singer-songwriter Kelly Clarkson from her fourth studio album, "All I Ever Wanted". It is co-written by Clarkson and Ryan Tedder, who also produced it. The song was released as the album's third single in August 2009. Lyrically, "Already Gone" is about the breakup of a relationship; the music consists of an arrangement using a piano, drums, and string instruments.
Document 7: Since U Been Gone: "Since U Been Gone" is a song recorded by American singer Kelly Clarkson from her second studio album, "Breakaway" (2004). The song, which was written and produced by Max Martin and Lukasz "Dr. Luke" Gottwald, was released as the lead single from "Breakaway" two weeks before the album was released. It is an uptempo pop rock and power pop power ballad that infuses electronic sound with a mixture of soft and loud alternative rock sound. Martin originally wrote "Since U Been Gone" with Pink in mind but she turned it down. It was then given to Hilary Duff but she rejected the song because she could not reach its higher notes. The song was finally given to Clarkson after Clive Davis convinced the writers to give it to her. Clarkson decided to add heavier guitars and harder drums to the song after noticing that the demo had an obvious pop sound. Lyrically, the song is written from a woman's point of view where she expresses her sense of relief with the end of her troubled relationship.
Document 8: American Idol: Both finalists found success after the show, but Aiken out-performed Studdard's coronation song "Flying Without Wings" with his single release from the show "This Is the Night", as well as in their subsequent album releases. The fourth-place finisher Josh Gracin also enjoyed some success as a country singer.
Document 9: Sober (Jennifer Paige song): "Sober" is a 1999 song written by Wayne Kirkpatrick and recorded by American singer Jennifer Paige. It was released in February 1999 as the second single released from her debut studio album "Jennifer Paige". It failed to chart in her native United States, however, it managed to enter UK Top 75, as well as in Australia and New Zealand, where it became a minor hit.
Document 10: Because of You (Kelly Clarkson song): "Because of You" is a song recorded by American pop singer Kelly Clarkson for her second studio album, "Breakaway" (2004). It was written by Clarkson along with its producers David Hodges and Ben Moody, both from Evanescence. It was released on August 16, 2005 by RCA Records, as the third single from "Breakaway". Clarkson originally wrote "Because of You" when she was 16 years old to cope with the emotional distress caused by her parents' divorce. She wanted the song to be included on her debut studio album, "Thankful" (2003), but her record label rejected the song. She then polished the song with Hodges and Moody before successfully convincing her label to include it on "Breakaway".
Document 11: Justin Guarini: Justin Guarini (born Justin Eldrin Bell; October 28, 1978) is an American singer / musician, actor, host and producer, who in 2002 was the runner - up on the first season of American Idol.
Document 12: The Trouble with Love Is: "The Trouble with Love Is" is a song by American singer-songwriter Kelly Clarkson, for her debut studio album "Thankful" (2003). The song was written by Clarkson with its producers Evan Rogers and Carl Sturken. It was released as the fourth and final single from the album, being first serviced to US contemporary hit radio on November 12, 2003. "The Trouble with Love Is" is an R&B and soul ballad, with elements of gospel music in its chorus. Lyrically, the song finds Clarkson explaining how love can be joyful and sorrowful at the same time. It received mostly positive reviews from music critics, who praised it for being "soulful" and "romantic", while also praising Clarkson's vocals, comparing them to those of Mariah Carey and Beyoncé.
Document 13: American Idol: The final showdown was between Justin Guarini, one of the early favorites, and Kelly Clarkson. Clarkson was not initially thought of as a contender, but impressed the judges with some good performances in the final rounds, such as her performance of Aretha Franklin's "Natural Woman", and Betty Hutton's "Stuff Like That There", and eventually won the crown on September 4, 2002.
Document 14: Kelly Clarkson: Kelly Brianne Clarkson (born April 24, 1982) is an American singer and songwriter. She rose to fame in 2002 after winning the inaugural season of the television series American Idol, which earned her a record deal with RCA Records. Clarkson's debut single, ``A Moment Like This '', topped the US Billboard Hot 100 chart and became the country's best - selling single of 2002. It was followed by the release of her debut album, Thankful (2003), which debuted atop the US Billboard 200. Trying to reinvent her image, Clarkson decided to part ways with Idol management and her second album, Breakaway (2004), featured a pop rock sound. It sold over 12 million copies worldwide and earned Clarkson two Grammy Awards.
Document 15: Never Again (Kelly Clarkson song): "Never Again" is a song recorded by American pop singer Kelly Clarkson for her third studio album, "My December" (2007). Clarkson co-wrote the song with Jimmy Messer while produced by American producer and musician David Kahne. Clarkson stated that the song was written as a counterpart to the songs from her second studio album, "Breakaway" (2004), and was almost removed because of its harsh lyrical nature. RCA Records serviced the song to mainstream radios in the United States on April 24, 2007. "Never Again" features a stronger rock sound than Clarkson's previous releases, but maintains some pop undertones. It relies on strings, guitar riffs and drums and is centered on angry, abrasive lyrics.
ground_truth: September
sub_queries: Sober >> performer Answer: Kelly Clarkson
What month did Kelly Clarkson win? Answer: September