Question: Who is the song We Belong Together by the person who also performed Someday about?

full_context: Document 1: Forever (Mariah Carey song): "Forever" is a song by American singer and songwriter Mariah Carey from her fifth studio album, "Daydream". It was released by Columbia Records on March 10, 1996, as an airplay-only single from the album. The song was written and produced by Carey and Walter Afanasieff, and was composed throughout 1995. Its lyrics describe a situation where the protagonist knows her relationship with her lover has withered away, however he will continue living in her memory forever.
Document 2: Music Box (Mariah Carey album): Music Box is the third studio album by American singer Mariah Carey. It was released by Columbia Records on August 31, 1993, in North America. The album comprises ballads primarily co-written by Carey and Walter Afanasieff, with whom she had previously worked on "Emotions" (1991), and a few urban dance tracks. During the course of the album's development, Carey wanted to broaden her audience, choosing a more pop/R&B oriented sound. During this time frame, she experimented with different musical instruments, leading the album's sound away from her more contemporary previous two efforts. Two unused tracks from the album sessions were released as B-sides: "Do You Think of Me" and "Everything Fades Away".
Document 3: 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 4: 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 5: Heartbreaker (Mariah Carey song): Carey performed "Heartbreaker" live on several television and award show appearances around the world, as well as on her concert tours. The accompanying music video for "Heartbreaker", directed by Brett Ratner, is one of the most expensive ever made, costing over $2.5 million. The video features Carey and her friends visiting a film theater and catching her boyfriend (played by Jerry O'Connell) on a date with another woman. Carey played herself and a brunette villainess named Bianca, during a physical altercation scene in between the two women. Due to contractual agreements at the time of its filming, Jay-Z was unable to make an appearance in the video, instead being portrayed as an animated cartoon. The video was inspired by several films, including "Grease" and "Enter the Dragon".
Document 6: We Belong Together: The song's music video was filmed as a two - part story with ``It's Like That '', which featured Carey at her bachelorette party. The video for`` We Belong Together'' is a continuation focusing on Carey's wedding to an older and powerful man and ends with the singer eloping with her ex-lover. Rumors arose of the video's connection to her 1993 marriage to Tommy Mottola. Carey performed the song on several award shows and television appearances around the world, namely MTV Movie Awards, MTV Video Music Awards, Macy's Fourth of July Parade, The Oprah Winfrey Show and the 48th Grammy Awards. In Europe the song was performed at the Live 8 charity concert, the Fashion Rocks in Monaco, and the German Bambi Awards. Carey performed the song on both her Adventures of Mimi and Angels Advocate Tours.
Document 7: Emotions (Mariah Carey album): Emotions is the second studio album by American singer and songwriter Mariah Carey. It was released on September 17, 1991 by Columbia Records. The album deviated from the formula of Carey's 1990 self-titled debut album, as she had more creative control over the material she produced and recorded. Additionally, "Emotions" features influences from a range of genres such as gospel, R&B, soul and 1950s, 1960s and 1970s balladry infusion. On the record, Carey worked with a variety of producers and writers, including Walter Afanasieff, the only hold over from her previous effort. Additionally, Carey wrote and produced the album's material with Robert Clivillés and David Cole from C+C Music Factory and Carole King, with whom she wrote one song.
Document 8: Someday (Mariah Carey song): "Someday" is a song by American singer and songwriter Mariah Carey from her self-titled debut studio album (1990). It is a dance-pop song with new jack swing influences. Prior to Carey signing a record contract, she and producer Ben Margulies had written and produced a four-track demo which included "Someday". After signing a contract with Columbia Records, Carey began work on her debut album and she reached out to Ric Wake to ask if he would produce the song, to which he agreed. The composition of the demo recording was changed during the recording process, most notably replacing the horns with a guitar, which Carey disapproved of.
Document 9: We Are Never Ever Getting Back Together: The video, which is done seemingly as one continuous shot, begins with Swift in colorful pajamas recounting the events of her off and on again relationship with her ex-boyfriend (played by Noah Mills). The video then segues into Swift going into her living room where her band is dressed up in animal costumes and Swift belts out the chorus of the song. The video then goes to a TV where Swift says ``Like, ever. ''and then to the dining room where we see she returns to recounting the events of her relationship and receives a phone call from her ex who is calling her from a nightclub. Swift hangs up on him and he walks off screen into the nightclub. It then goes to the two in a truck having an argument then to them having a stroll in the park. Swift then runs off and we see her on the phone telling the person on the other line how she and her ex are not getting back together and her frustration of their entire relationship. The video then segues back to Swift's living room where a party is going on and her ex shows up unannounced trying to woo her back and she slams the door in his face. The video ends with Swift on her window ledge where she was at the beginning of the video, singing the last line of the song.
Document 10: Someday (I Will Understand): "Someday (I Will Understand)" is a song recorded by American singer Britney Spears. It was written by Spears and produced by Guy Sigsworth. The song was released on August 18, 2005, by Jive Records, as the sole single from Spears' first extended play, "" (2005). In July 2004, Spears announced her engagement to American dancer Kevin Federline, later revealing she would be taking another career break to start a family. Spears wrote the song two weeks before knowing she was pregnant with her first child, Sean Preston Federline. A pop ballad, "Someday (I Will Understand)" lyrics refer to a feeling of empowerment as a pregnant woman. A remixed version of the song was included on the 2005 remix compilation, "".
Document 11: Upgrade U: The music video for the song was directed by Melina Matsoukas, and took one and a half days of shooting. Knowles did an impersonation of Jay-Z in the clip and is also seen amidst gold watches and jewelry, continuing the motif of luxury that is alluded to in the song. It finally emerged as the forty-fifth best R&B/Hip-Hop song of 2007 in the United States. Although Knowles did not perform "Upgrade U" in any televised appearances, the song was a part of her set list on The Beyoncé Experience tour (2007), and I Am... Tour (2009–10), as well as her and Jay Z's joint On the Run Tour (2014).
Document 12: Beyoncé: Beyoncé is believed to have first started a relationship with Jay Z after a collaboration on "'03 Bonnie & Clyde", which appeared on his seventh album The Blueprint 2: The Gift & The Curse (2002). Beyoncé appeared as Jay Z's girlfriend in the music video for the song, which would further fuel speculation of their relationship. On April 4, 2008, Beyoncé and Jay Z were married without publicity. As of April 2014, the couple have sold a combined 300 million records together. The couple are known for their private relationship, although they have appeared to become more relaxed in recent years. Beyoncé suffered a miscarriage in 2010 or 2011, describing it as "the saddest thing" she had ever endured. She returned to the studio and wrote music in order to cope with the loss. In April 2011, Beyoncé and Jay Z traveled to Paris in order to shoot the album cover for her 4, and unexpectedly became pregnant in Paris.
Document 13: There's Got to Be a Way: "There's Got to Be a Way" is a song by American singer and songwriter Mariah Carey from her self-titled debut studio album (1990). Columbia released it as the fifth and final single from the album in the United Kingdom. It was one of four songs Carey wrote with Ric Wake during their first recording session together in February 1990, but "There's Got to Be a Way" was the only composition to make the final track listing. It is a socio-political conscious R&B-pop song which addresses the existence of poverty, racism and war in the world which gradually becomes more aspirational and positive as it progresses. The track garnered a mixed reception upon the album's release in 1990. While Carey's vocals were praised, it was seen as too political. An accompanying music video highlights social injustices. The song reached number 54 on the UK Singles Chart.
Document 14: You Belong with Me: The song's accompanying music video was directed by Roman White. The video featured Swift portraying two characters, a nerd (the protagonist and narrator) and a popular girl (the antagonist and girlfriend), while American actor Lucas Till portrayed the male lead. The video's plot centers on the protagonist secretively loving the male lead, although he has a girlfriend. The video won the MTV Video Music Award for Best Female Video at the 2009 MTV Video Music Awards, but during Swift's acceptance speech, rapper Kanye West interrupted, protesting in support of Beyoncé. The incident caused a reaction in the media, with many coming to Swift's defense. The song was performed live at numerous venues, including the 2009 -- 10 Fearless Tour, where it was the opening number. It was covered by various artists, including Butch Walker and Selena Gomez & the Scene, and parodied by ``Weird Al ''Yankovic.
Document 15: Rainbow (Mariah Carey album): Rainbow is the seventh studio album by American singer and songwriter Mariah Carey. It was released on November 2, 1999, by Columbia Records. The album followed the same pattern as Carey's previous two albums, "Daydream" (1995) and "Butterfly" (1997), in which she began her transition into the urban market. "Rainbow" contains a mix of hip hop-influenced R&B jams, as well as a variety of slow ballads. On the album, Carey worked with David Foster and Diane Warren, who, as well as Jimmy Jam & Terry Lewis, replaced Walter Afanasieff, the main balladeer Carey worked with throughout the 90s. As a result of her separation from her husband, Tommy Mottola, Carey had more control over the musical style of this album, so she collaborated with several artists such as Jay-Z, Usher, and Snoop Dogg, as well as Missy Elliott, Joe, Da Brat, Master P, 98°, and Mystikal.
ground_truth: Tommy Mottola
sub_queries: Someday >> performer Answer: Mariah Carey
who is we belong together by Mariah Carey about Answer: Tommy Mottola