Question: What month did the performer of Can We Go Back win American Idol?

full_context: Document 1: 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 2: 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 3: 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 4: Back to December: ``Back to December ''is a song written and recorded by American singer / songwriter Taylor Swift for her third studio album Speak Now (2010). The song was sent to country radio in the United States on November 15, 2010, as the second single from Speak Now. According to Swift,`` Back to December'' is the first time she ever apologizes to someone in a song. Critics speculate that the song is about Taylor Lautner, Swift's ex-boyfriend, which was later acknowledged by Lautner. ``Back to December ''is considered an orchestral country pop ballad and its lyrics are a remorseful plea for forgiveness for breaking up with a former lover.
Document 5: 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 6: 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 7: I Wanna Go Back: "I Wanna Go Back" is a 1984 song by American rock band Billy Satellite, written by band members Monty Byrom, Danny Chauncey, and Ira Walker, that achieved major popularity when recorded by Eddie Money in 1986. Another version was recorded by former Santana/Journey keyboardist/singer Gregg Rolie for his self-titled 1985 debut solo album.
Document 8: Can We Go Back: Can We Go Back is a song written by Adam Watts, Andy Dodd and Shanna Crooks and recorded by Kelly Clarkson during the sessions for her 2009 album, "All I Ever Wanted." It appeared as a iTunes Store pre-order song for the deluxe version of the album, as well as a bonus track on the Japanese deluxe version of the album. It was then later recorded in Japanese by singer Kumi Koda in 2009 with differing lyrics.
Document 9: 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 10: 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 11: 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 12: I Go Back: "I Go Back" is a song written and recorded by American country music artist Kenny Chesney. It was released in May 2004 as the third single from his 2004 album "When the Sun Goes Down". The song spent seven weeks at number 2 on the U.S. "Billboard" Hot Country Songs chart in mid-2004, behind "Live Like You Were Dying" by Tim McGraw.
Document 13: Cry (Kelly Clarkson song): "Cry" is a song by American singer and songwriter Kelly Clarkson, taken from her fourth studio album, "All I Ever Wanted" (2009). It was written by Clarkson, Jason Halbert and Mark Townsend, with production being done by Howard Benson. It was released as the album's fourth single (fifth and final overall) only in Australia and Germany; it was released as a digital download on March 12, 2010 in Germany and added to Australian radio stations on March 15, 2010.
Document 14: 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 15: I Do Not Hook Up: "I Do Not Hook Up" is a song performed by American pop singer-songwriter Kelly Clarkson, released as the second single from her fourth studio album, "All I Ever Wanted" (2009). The song was composed by Greg Wells, Kara DioGuardi and American singer and songwriter Katy Perry. Perry had originally written the song for her own album, but following her removal from the Def Jam label, she gave the song and "Long Shot" to Clarkson for her fourth album. RCA Records serviced the song to mainstream radios in the United States on April 14, 2009. "I Do Not Hook Up" is a dance-rock and power pop song that is structured upon a muscular arrangement with lyrics about empowerment and healthy relationships.
ground_truth: September
sub_queries: Can We Go Back >> performer Answer: Kelly Clarkson
What month did Kelly Clarkson win? Answer: September