Question: Which season of American Idol featured By the Grace of God's composer as a guest judge?

full_context: Document 1: Ur So Gay: "Ur So Gay" is a song released by American singer Katy Perry from her EP of the same name. She co-wrote the song with its producer Greg Wells while Drew Pearson served as the track's engineer. It was later included on her album "One of the Boys". Capitol Records offered the song as a free download on their website. The song failed to enter the "Billboard" Hot 100.
Document 2: 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 3: Grace (Miss Kittin song): "Grace" is a song by French recording artist Miss Kittin. It is the second and final single from her fourth studio album "BatBox" (2008). Co-written and produced by Pascal Gabriel, it is composed as an electropop love song.
Document 4: 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 5: The One That Got Away (Katy Perry song): "The One That Got Away" is a song by American singer Katy Perry for her third studio album, "Teenage Dream" (2010). The song was produced by Dr. Luke and Max Martin, both of whom also co-wrote the song with Perry. The song is a mid-tempo pop ballad about a lost love. It features references to the rock band Radiohead as well as the relationship of Johnny Cash and June Carter Cash to express the strength of the relationship. The song was released in October 2011 by Capitol Records as the album's sixth single.
Document 6: 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 7: Katy Perry: Part of Me: The film features interviews with Perry and her loved ones documenting the trajectory of her life, containing various clips from her childhood and teenage years as well as her career and personal life. The film is spliced with performances from her worldwide California Dreams Tour, which had 127 concerts from February 20, 2011 to January 22, 2012. Most of the performances were recorded on November 23, 2011, at the Staples Center in Los Angeles, but also included performances in Tokyo and São Paulo. Some of her friends such as Rihanna, Lady Gaga, Adele and Jessie J make cameos in the film. The documentary includes scenes of Perry dealing with the breakdown of her marriage with English actor/comedian Russell Brand.
Document 8: 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 9: 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.
Document 10: 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 11: 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 12: Part of Me (Katy Perry song): "Part of Me" is a song by American singer Katy Perry, released as the lead single from "". It was written by Perry, and Bonnie McKee, with production and additional writing by Dr. Luke, Max Martin, and Cirkut. The song was not included on the original edition of "Teenage Dream" because Perry felt that it did not fit the composition of the album. A demo of the song leaked online in late 2010, amid speculation that the lyrics were directed to the singer's ex-boyfriend Travie McCoy. "Part of Me" was re-worked and officially released on February 13, 2012, through Capitol Records with artwork by art director Gavin Taylor and photography by Mary Ellen Matthews.
Document 13: This Is How We Do: "This Is How We Do" is a song recorded by American singer Katy Perry for her fourth studio album, "Prism" (2013). Perry co-wrote the song with its producers Max Martin and Klas Åhlund and recorded it in Stockholm, Sweden. The song was released as the album's fifth and final single on August 11, 2014. "This Is How We Do" is a dance-pop song influenced by hip hop, having "synth squiggles" and "melodic dots" as its main instrumentation. Lyrically, it has Perry sing-talking about her hangout routine with her friends. The song's official remix featuring American rapper Riff Raff was released on August 25, 2014.
Document 14: By the Grace of God (song): "By the Grace of God" is a song by American singer Katy Perry from her fourth studio album, "Prism" (2013), included as the standard edition's closing track. The song was written and produced by Perry and Canadian record producer Greg Wells. It was conceived following Perry's divorce from English actor and comedian Russell Brand. This initially made Perry consider making a "darker" album, but instead was channeled into the song. Throughout its autobiographical lyrics, Perry is depicted finding her strength and standing up for herself.
Document 15: The One That Got Away (Katy Perry song): Originally titled ``In Another Life '', the song was produced by Dr. Luke and Max Martin, both of whom co-wrote it with Perry. It is a midtempo pop song positioned on the piece of E major and has a tempo of 134 beats per minute. Joanna Holcombe from Yahoo! Music noted that the song is about first loves. Leah Greenblatt from Entertainment Weekly, said that the song is`` a midtempo ode to a summer - after - high - school love with whom she recalls sharing Mustang makeout sessions to Radiohead '''. Michael Wood from Spin magazine said that the song is one of the album's quieter cuts and that it recall (s) ``Perry's singer - songwriter days at L.A.'s Hotel Café ''. The song follows the chord progression of E -- G ♯ m -- C ♯ m -- A, and Perry's vocal range spans from B to E. Kitty Empire noticed that Perry's vocal is wistful throughout the song and that the references to June and Johnny Cash were unexpected. Rob Sheffield from Rolling Stone stated that when Perry sings,' I was June, and you were my Johnny Cash, '`` it's understood that she's thinking of the scrubbed - up Hollywood version of June and Johnny, from Walk the Line.'' In 2017, the singer revealed that ``The One That Got Away ''was about Josh Groban.
ground_truth: season nine
sub_queries: By the Grace of God >> composer Answer: Katy Perry
Which season of American Idol featured Katy Perry as a guest judge? Answer: season nine