Question: Who did the singer she joined on MTV Unplugged to sing with play in Hannah Montana?

full_context: Document 1: Madonna (entertainer): Madonna gave another provocative performance later that year at the 2003 MTV Video Music Awards, while singing "Hollywood" with Britney Spears, Christina Aguilera, and Missy Elliott. Madonna sparked controversy for kissing Spears and Aguilera suggestively during the performance. In October 2003, Madonna provided guest vocals on Spears' single "Me Against the Music". It was followed with the release of Remixed & Revisited. The EP contained remixed versions of songs from American Life and included "Your Honesty", a previously unreleased track from the Bedtime Stories recording sessions. Madonna also signed a contract with Callaway Arts & Entertainment to be the author of five children's books. The first of these books, titled The English Roses, was published in September 2003. The story was about four English schoolgirls and their envy and jealousy of each other. Kate Kellway from The Guardian commented, "[Madonna] is an actress playing at what she can never be—a JK Rowling, an English rose." The book debuted at the top of The New York Times Best Seller list and became the fastest-selling children's picture book of all time.
Document 2: Hannah Montana: Hannah Montana, also known as Hannah Montana Forever in its fourth and final season, is an American musical comedy television series created by Michael Poryes, Rich Correll, and Barry O'Brien. It focuses on Miley Stewart (portrayed by Miley Cyrus), who is a teenager living a double life as an average schoolgirl by day and as the famous recording artist Hannah Montana by night. The story follows the daily life of Stewart, her brother, and her friends while also starring Cyrus's country singer father Billy Ray Cyrus as her dad.
Document 3: Beyoncé: In December, Beyoncé along with a variety of other celebrities teamed up and produced a video campaign for "Demand A Plan", a bipartisan effort by a group of 950 US mayors and others designed to influence the federal government into rethinking its gun control laws, following the Sandy Hook Elementary School shooting. Beyoncé became an ambassador for the 2012 World Humanitarian Day campaign donating her song "I Was Here" and its music video, shot in the UN, to the campaign. In 2013, it was announced that Beyoncé would work with Salma Hayek and Frida Giannini on a Gucci "Chime for Change" campaign that aims to spread female empowerment. The campaign, which aired on February 28, was set to her new music. A concert for the cause took place on June 1, 2013 in London and included other acts like Ellie Goulding, Florence and the Machine, and Rita Ora. In advance of the concert, she appeared in a campaign video released on 15 May 2013, where she, along with Cameron Diaz, John Legend and Kylie Minogue, described inspiration from their mothers, while a number of other artists celebrated personal inspiration from other women, leading to a call for submission of photos of women of viewers' inspiration from which a selection was shown at the concert. Beyoncé said about her mother Tina Knowles that her gift was "finding the best qualities in every human being." With help of the crowdfunding platform Catapult, visitors of the concert could choose between several projects promoting education of women and girls. Beyoncé is also taking part in "Miss a Meal", a food-donation campaign, and supporting Goodwill charity through online charity auctions at Charitybuzz that support job creation throughout Europe and the U.S.
Document 4: Madonna (entertainer): By 2013, Madonna's Raising Malawi organization built ten schools to educate 4,000 children in Malawi at a value of $400,000. When Madonna visited the schools in April 2013, President of Malawi Joyce Banda expressed criticism of the star and her charity, accusing her of exaggerating her charity's contribution. Madonna responded by releasing a statement saying she was saddened that Banda had chosen to act negatively about her endeavors. "I have no intention of being distracted by these ridiculous allegations," she added. Later, it was confirmed that Banda had not approved the statement released written by her press team and was "incandescent with anger" over the mix-up.
Document 5: Robby Stewart: Robby Ray Stewart is a fictional character from the Disney Channel series "Hannah Montana", portrayed by Billy Ray Cyrus. Robby is the single father of Jackson Stewart (Jason Earles) and Miley Stewart (Miley Cyrus). He appears in all episodes in seasons 1 and 2, is absent for 3 episodes in season 3, and is absent for 1 episode in season 4.
Document 6: Hannah Montana Forever: Hannah Montana Forever is the soundtrack album for the fourth and final season of the television series "Hannah Montana", released on October 15, 2010 by Walt Disney Records. All eleven tracks are performed by its primary actress Miley Cyrus, and are credited to her character Hannah Montana. Recording artists Billy Ray Cyrus, Iyaz, and Sheryl Crow appear as featured vocalists. The soundtrack is primarily a pop record, which sees additional influences from teen pop, pop rock, power pop, dance-pop, and country pop musical styles.
Document 7: Hannah Montana (season 4): The fourth and final season of the television series "Hannah Montana" (marketed as Hannah Montana Forever) began airing on Disney Channel on July 11, 2010. Disney Channel renewed the series for a fourth season on June 1, 2009 along with "Sonny With a Chance", and production of the season began on January 18, 2010, and ended on May 14, 2010. In this season, Mitchel Musso's character Oliver Oken becomes a recurring character, and is no longer in the main cast, due to Musso starring on the Disney XD series "Pair of Kings". In the season, the Stewarts and Lilly move to a ranch in Malibu. This is the only season of the show to be broadcast in High Definition. The season ended on January 16, 2011 (USA) and May 27, 2011 (UK & Ireland).
Document 8: Madonna (entertainer): From the beginning of 2014, Madonna began to make multiple media appearances. She appeared at the 56th Annual Grammy Awards in January 2014, performing "Open Your Heart" alongside rappers Macklemore & Ryan Lewis and singer Mary Lambert, who sang their single "Same Love", as 33 couples were wed onstage, officiated by Queen Latifah. Days later, she joined singer Miley Cyrus on her MTV Unplugged special, singing a mash-up of "Don't Tell Me" and Cyrus' single "We Can't Stop" (2013). She also extended her business ventures and in February 2014 the singer premiered MDNA Skin, a range of skin care products, in Tokyo, Japan. After visiting her hometown of Detroit during May 2014, Madonna decided to contribute funds to three of the city's organizations, to help eliminate poverty from there. The singer released a statement saying that she was inspired by their work, adding that "it was obvious to me that I had to get involved and be part of the solution to help Detroit recover".
Document 9: Hannah Montana: Hannah Montana, also known as Hannah Montana Forever in its fourth and final season, is an American musical comedy television series created by Michael Poryes, Rich Correll, and Barry O'Brien. It focuses on Miley Stewart (portrayed by Miley Cyrus), who is a teenager living a double life as an average schoolgirl by day and as the famous recording artist Hannah Montana by night, which she keeps secret and only a few people know of her alter ego. The story follows the daily life of Stewart, her brother Jackson, her best friends Lily and Oliver, and her father Robby (Cyrus's real-life country singer father, Billy Ray Cyrus).
Document 10: Madonna (entertainer): Madonna released the song "Hey You" for the Live Earth series of concerts. The song was available as a free download during its first week of release. She also performed it at the London Live Earth concert. Madonna announced her departure from Warner Bros. Records, and a new $120 million, ten-year 360 deal with Live Nation. She produced and wrote I Am Because We Are, a documentary on the problems faced by Malawians. The documentary was directed by Nathan Rissman, who worked as Madonna's gardener. She also directed her first film Filth and Wisdom. The plot of the film revolved around three friends and their aspirations. The Times said she had "done herself proud" while The Daily Telegraph described the film as "not an entirely unpromising first effort [but] Madonna would do well to hang on to her day job." In December 2007, the Rock and Roll Hall of Fame announced Madonna as one of the five inductees of 2008. At the induction ceremony on March 10, 2008, Madonna did not sing but asked fellow Hall of Fame inductees and Michigan natives The Stooges to perform her songs "Burning Up" and "Ray of Light". She thanked Christopher Flynn, her dance teacher from 35 years earlier, for his encouragement to follow her dreams.
Document 11: Ordinary Girl (Hannah Montana song): "Ordinary Girl" is a song by American singer–songwriter and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart – a character she plays on the Disney Channel television series "Hannah Montana". It was released to Radio Disney on July 2, 2010 as promotion for the fourth season of "Hannah Montana". Lyrically, the track speaks about how Hannah Montana might be famous, but she is just an ordinary girl underneath. The song was later released on July 6, 2010 through digital distribution as the lead single from the soundtrack of the same title as the special title ("Hannah Montana Forever") of the fourth and final season of the series.
Document 12: Madonna (entertainer): Madonna also began work on her thirteenth studio album, with collaborators including Avicii, Diplo and Natalia Kills. In December 2014, thirteen demos recorded for the album leaked onto the Internet. She posted in response that half of the tracks would not be used on the final release, while the other half had "changed and evolved". The album, titled Rebel Heart, was released on March 10, 2015. From September 2015, she embarked on the Rebel Heart Tour to promote the album; the tour ended in March 2016 and traveled throughout North America, Europe and Asia and was the singer's first visit to Australia in 23 years, where she also performed a one-off show for her fans. It grossed a total of $169.8 million from the 82 shows, with over 1.045 million ticket sales. While on tour Madonna became embroiled in a legal battle with Ritchie, over the custody of her son Rocco. The dispute started when Rocco decided to continue living at England with Ritchie when the Rebel Heart Tour had visited there, while Madonna wanted him to return with her. Court hearings took place in both New York and London, and after multiple deliberations, Madonna decided to withdraw her application for custody, and appealed for a mutual discussion between herself and Ritchie about Rocco.
Document 13: Madonna (entertainer): Madonna released and performed the song "Hey You" at the London Live Earth concert in July 2007. She announced her departure from Warner Bros. Records, and declared a new $120 million, ten-year 360 deal with Live Nation. In 2008, Madonna produced and wrote I Am Because We Are, a documentary on the problems faced by Malawians; it was directed by Nathan Rissman, who worked as Madonna's gardener. She also directed her first film, Filth and Wisdom. The plot of the film revolved around three friends and their aspirations. The Times said she had "done herself proud" while The Daily Telegraph described the film as "not an entirely unpromising first effort [but] Madonna would do well to hang on to her day job." On March 10, 2008, Madonna was inducted into the Rock and Roll Hall of Fame in her first year of eligibility. She did not sing at the ceremony but asked fellow Hall of Fame inductees and Michigan natives The Stooges to perform her songs "Burning Up" and "Ray of Light".Madonna released her eleventh studio album, Hard Candy, in April 2008. Containing R&B and urban pop influences, the songs on Hard Candy were autobiographical in nature and saw Madonna collaborating with Justin Timberlake, Timbaland, Pharrell Williams and Nate "Danja" Hills. The album debuted at number one in 37 countries and on the Billboard 200. Caryn Ganz from Rolling Stone complimented it as an "impressive taste of her upcoming tour", while BBC correspondent Mark Savage panned it as "an attempt to harness the urban market".
Document 14: Hannah Montana (soundtrack): Hannah Montana is the soundtrack album for the first season of the television series "Hannah Montana", released on October 24, 2006 by Walt Disney Records. The program itself premiered through the Disney Channel on March 24, 2006; after becoming an immediate commercial success, production on its soundtrack began the following month. Eight of its thirteen tracks are performed by the series' primary actress Miley Cyrus, and are credited to her character Hannah Montana. The groups The Click Five, Everlife, B5, and recording artist Jesse McCartney each contribute one recording, while a duet between Cyrus and her father Billy Ray Cyrus is included as the final track. "Hannah Montana" was reissued as a two-disc special edition on March 20, 2007. The soundtrack was further promoted during the Cheetah Girls' Party's Just Begun Tour, for which Cyrus served as an opening act, and her own Best of Both Worlds Tour.The soundtrack is primarily a teen pop record, which sees additional influences from pop rock and country pop musical styles. The lyrical themes revolve largely around "girl power", teen romance, and the double life that Cyrus' character lives on the program.
Document 15: Hannah Montana: Hannah Montana, also known as Hannah Montana Forever in its fourth and final season, is an American musical comedy television series created by Michael Poryes, Rich Correll, and Barry O'Brien. It focuses on Miley Stewart (portrayed by Miley Cyrus), who is a teenager living a double life as an average schoolgirl by day and as the famous recording artist Hannah Montana by night, which she keeps secret and only a few people know of her alter ego. The story follows the daily life of Stewart, her brother Jackson, her best friends Lily and Oliver, and her father Robby (Cyrus's real - life country singer father, Billy Ray Cyrus).
ground_truth: Miley Stewart
sub_queries: Which singer did she join on MTV Unplugged to sing? Answer: Miley Cyrus
who did Miley Cyrus play in hannah montana Answer: Miley Stewart