Question: When was the singer born who's song is "White Walls", with Ryan Lewis??

Context articles: Ryan Lewis
Flag of Belgrade
Macklemore &amp; Ryan Lewis
White Walls
White Privilege II
Downtown (Macklemore &amp; Ryan Lewis song)
Hollis (singer)
2013 MTV Video Music Awards
Macklemore
Ben Abraham (musician)

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.
The flag of Belgrade is composed of three Serbian national colours: red, blue and white.
 The blue symbolises hope and faith in better future.
 The red of the ground is a symbol of the suffering of Serbian people in a struggle for freedom.
 Two horizontal white lines represent the Sava and Danube rivers, which are symbols of the strength of Belgrade.
 They are white according to heraldry rules.
 "Beograd" is Serbian name for "white city," so there are white walls and towers.
 The walls represent a merchant city; the towers and open gate represent an open market.
 The ship, a Roman trireme, is a symbol of the antiquity of the city.
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).
"White Walls" is a song by an American hip hop duo Macklemore & Ryan Lewis, taken from their collaborative debut studio album "The Heist" (2012).
 The song's hook is performed by singer Hollis, while American rapper Schoolboy Q, performs a guest verse.
 "White Walls" was released to American contemporary hit radio on October 8, 2013 as the fifth and final single from "The Heist".
 The song debuted at number 100 and the song has since peaked at number 15 on the US "Billboard" Hot 100 and has sold 1,000,000 copies as of January 2014.
"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.
"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.
Hollis Wong-Wear, known mononymously as Hollis, is an American singer-songwriter and creative producer.
 She is best known for featuring on "White Walls", a song by Macklemore and Ryan Lewis, which also featured Schoolboy Q.
 Hollis is also a spoken-word artist.
 Her major debut was on Macklemore & Ryan Lewis' debut album, "The Heist".
 This was followed by the single "White Walls" in which she did the vocals for Macklemore and Ryan Lewis.
 This song peaked at number 15 on the Billboard Hot 100 chart.
The 2013 MTV Video Music Awards were held on August 25, 2013 at the Barclays Center in Brooklyn, New York.
 Marking the 30th installment of the award show, they were the first to be held in New York City not to use a venue within the borough of Manhattan.
 Nominations were announced on July 17, 2013.
 Leading the nominees were Justin Timberlake and Macklemore & Ryan Lewis with six, followed by Bruno Mars, Miley Cyrus, and Robin Thicke with four.
 Justin Timberlake was the big winner on the night with four awards, including Video of the Year for "Mirrors" and the Michael Jackson Vanguard Award.
 Macklemore & Ryan Lewis, Bruno Mars and Taylor Swift were also among the winners of the night.
 The ceremony drew a total of 10.1 million viewers.
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.
Ben Abraham is an Australian folk singer and songwriter from Melbourne.
 Ben is notable for collaborating with top artists such as: Kesha, Macklemore & Ryan Lewis, Demi Lovato and Sara Bareilles.
 His powerful hit song "Praying" by Kesha (which he co-wrote with Kesha and Ryan Lewis) has created an impactful buzz with tastemakers worldwide.