Question: What is the birth name of Ryan Lewis's partner on "This Unruly Mess I've Made"?

full_context: Document 1: Downtown (Macklemore &amp; Ryan Lewis song): "Downtown" is a song by American hip hop duo Macklemore & Ryan Lewis featuring Eric Nally, Melle Mel, Kool Moe Dee, and Grandmaster Caz. The song was officially released on August 27, 2015 as the lead single from their second studio album "This Unruly Mess I've Made" (2016). A music video for the song was uploaded to Ryan Lewis' own YouTube channel on the day of the song's release.
Document 2: Mac Miller discography: The discography of American rapper Mac Miller consists of four studio albums, two extended plays, eleven mixtapes, sixteen singles (including five as a featured artist), one promotional single and twenty-nine music videos. Miller began his career in 2007 as a member of the hip hop group The Ill Spoken before deciding to pursue a solo career. Following the release of several solo mixtapes, Miller signed to independent record label Rostrum Records in 2011. His debut extended play "On and On and Beyond" was released in March 2011, peaking at number 55 on the United States "Billboard" 200 albums chart. Miller's single "Donald Trump" became his first singles chart entry, peaking at number 75 on the US "Billboard" Hot 100 and later earning a gold certification from the Recording Industry Association of America (RIAA).
Document 3: Macklemore: Benjamin Hammond Haggerty (born June 19, 1983), known by his stage name Macklemore ( ), and formerly Professor Mack Lemore, is an American rapper from Seattle, Washington. He has collaborated with producer Ryan Lewis as Macklemore & Ryan Lewis. Since 2000, he has independently released one mixtape, three EPs, and four albums.
Document 4: Matt de Jong: Matt de Jong is a graphic designer and art director who specializes in album art and related promotional materials for musicians. He has designed album covers for artists including Cat Power, Clean Bandit, Deerhunter, Future Islands, Little Dragon, The Maccabees, Paolo Nutini, Lee Ranaldo, Ratking, and Vampire Weekend. de Jong is known for working with musicians who have a reputation for being "difficult" and nevertheless creating album art that pleases them. Lionel Skerratt, who co-founded Public Information Records, and Orlando Weeks, lead singer of The Maccabees, are childhood friends of de Jong's.
Document 5: Eminem: Marshall Bruce Mathers III (born October 17, 1972), known professionally as Eminem (often stylized as EMINƎM), is an American rapper, record producer, and actor.
Document 6: Kendrick Lamar: Kendrick Lamar Duckworth (born June 17, 1987) is an American rapper and songwriter. Born and raised in Compton, California, he embarked on his musical career as a teenager under the stage name K-Dot, releasing a mixtape that garnered local attention and led to his signing with indie record label Top Dawg Entertainment (TDE). He began to gain recognition in 2010, after his first retail release, "Overly Dedicated". The following year, Lamar independently released his first studio album, "Section.80", which included his debut single, "HiiiPoWeR". By that time, he had amassed a large Internet following and collaborated with several prominent artists in the hip hop industry, including The Game, Busta Rhymes, Lil Wayne and Snoop Dogg.
Document 7: White Privilege II: "White Privilege II" is a song by American hip hop duo Macklemore & Ryan Lewis from their second album "This Unruly Mess I've Made" (2016). The song, a sequel to Macklemore's solo song "White Privilege" from his first album "The Language of My World" (2005), discusses white privilege and the social movement associated with Black Lives Matter. According to the duo, "this song is the outcome of an ongoing dialogue with musicians, activists, and teachers within our community in Seattle and beyond. Their work and engagement was essential to the creative process." The song's lyrics span around nine minutes and 1300 words. One of the project's collaborators is Chicago singer Jamila Woods, whose voice is featured on the track. "White Privilege II" was released as promotional single on January 22, 2016.
Document 8: This Unruly Mess I've Made: This Unruly Mess I've Made is the second studio album by American hip hop duo Macklemore & Ryan Lewis. It was released on February 26, 2016, by Macklemore LLC and Alternative Distribution Alliance. The album was supported by three singles: "Downtown" featuring Eric Nally, Melle Mel, Kool Moe Dee and Grandmaster Caz and "Dance Off" featuring Idris Elba and Anderson Paak, along with "White Privilege II" featuring Jamila Woods, which was released as the album's promotional single.
Document 9: Jeff Bhasker: Jeff Bhasker (also known as Billy Kraven and U.G.L.Y.) is an American record producer, songwriter, keyboardist, vocalist, and multi-instrumentalist. He collaborated with rapper and producer Kanye West on the albums "808s & Heartbreak", "My Beautiful Dark Twisted Fantasy", and "Watch the Throne". He has won Grammy Awards for the songs "Run This Town" by Jay-Z, "All of the Lights" by Kanye West, "We Are Young" by Fun., and "Uptown Funk" by Mark Ronson. Bhasker received the 2016 Grammy Award for Producer of the Year, Non-Classical for co-producing Mark Ronson's album "Uptown Special" and producing Nate Ruess's album "Grand Romantic" among other records.
Document 10: Macklemore &amp; Ryan Lewis: Macklemore & Ryan Lewis are an American hip hop duo, formed in 2008, from Seattle, Washington. The duo is composed of Ben Haggerty, a rapper who goes by the stage name of Macklemore, and Ryan Lewis, a record producer, DJ, and professional photographer, who met the former at a photo shoot and they have significantly collaborated ever since. In 2009, they released their first collaborative effort, an EP titled "VS. EP". They have since followed up with "VS. Redux" (2010), the Grammy Award-winning album "The Heist" (2012) and "This Unruly Mess I've Made" (2016).
Document 11: Mike Will Made It: Michael Len Williams II (born March 23, 1989), known professionally as Mike Will Made It (often stylized as Mike WiLL Made-It) or simply Mike Will, is an American record producer, rapper, singer and songwriter from Atlanta, Georgia. He is best known for producing trap beats for several Southern hip hop artists as well as for producing several singles, such as "Black Beatles" by Rae Sremmurd, "Mercy" by GOOD Music, "No Lie" by 2 Chainz, "Bandz a Make Her Dance" by Juicy J, "Pour It Up" by Rihanna, "Love Me" by Lil Wayne, "Body Party" by Ciara, "We Can't Stop" by Miley Cyrus, "First Day Out the Feds" by Gucci Mane, "Formation" by Beyoncé, and "Humble" by Kendrick Lamar. He has released six mixtapes.
Document 12: Emurge: Emurge is the widely bootlegged and unreleased demo album by American hip hop recording artist Hopsin. It is widely believed the project was recorded sometime in 2003 and was not a retail mixtape like other common mixtapes and the project was created for a local audience to create a buzz for the artist who at the time had decided to take rapping seriously, prior to rapping Hopsin had appeared in TV shows such as "Malcolm in the Middle" and "That's So Raven" among others. No official physical copies of Emurge have been found / sold online however in 2012 Hopsin's official YouTube account released all songs off "Emurge" for free. Throughout the years there have been many fake and misleading mixtapes also titled Emurge with other unreleased material on them. Songs such as "Break It Down" were later featured on Hopsin's official debut studio album "Gazing at the Moonlight". This project is widely believed to be Hopsin's demo tape he used to show to various record labels to get him mainstream attention.
Document 13: Meek Mill: Robert Rihmeek Williams (born May 6, 1987), better known by his stage name, Meek Mill, is an American hip hop recording artist. Raised in Philadelphia, he embarked on his music career as a battle rapper, and later formed a short-lived rap group, The Bloodhoundz. In 2008, Atlanta-based rapper T.I. signed Meek Mill to his first record deal. In February 2011, after leaving Grand Hustle Records, Mill signed with Miami-based rapper Rick Ross's Maybach Music Group (MMG). Mill's debut album, "Dreams and Nightmares", was released in 2012 under MMG and Warner Bros. Records. The album, preceded by the single "Young & Gettin' It", debuted at number two on the U.S. "Billboard" 200.
Document 14: Ryan Lewis: Ryan S. Lewis (born March 25, 1988) is an American DJ, musician, record producer, videographer, photographer, graphic designer, music video director, and rapper. Along with producing his own album titled "Instrumentals", Lewis produced the albums "The VS. EP" (2009), "The Heist" (2012), and "This Unruly Mess I've Made" (2016) as part of the duo Macklemore & Ryan Lewis. In 2006, Lewis befriended rapper Macklemore on Myspace and soon after became the behind-the-scenes partner of a successful duo, producing, recording, engineering and mixing all of the duo's music, as well as directing the music videos for "Same Love", "Thrift Shop", "And We Danced", "Otherside (Remix)", "Can't Hold Us", "Irish Celebration", "My Oh My", "Victory Lap", "Downtown" "Brad Pitt's Cousin" and "White Walls" and designing promotional graphics.
Document 15: Rap Monster: Kim Nam-joon (Hangul: 김남준 ; born September 12, 1994), better known as Rap Monster, is a South Korean rapper, songwriter, and record producer. He is the main rapper and songwriter of the South Korean boy group BTS, managed under Big Hit Entertainment. In 2015, he released his first solo mixtape, "RM". To date, he has recorded with artists such as Wale, Warren G, Gaeko, Krizz Kaliko, MFBTY, and Primary.
ground_truth: Benjamin Hammond Haggerty