Question: Which choir collaborated on a mix tape that was produced among others by the group The Social Experiment and that featured the song "Angels"?

full_context: Document 1: Angels (Chance the Rapper song): "Angels" is a song by American hip hop recording artist Chance the Rapper. The song was released on October 27, 2015 as the lead single from his third solo mixtape, "Coloring Book" (2016). The track, produced by Lido and The Social Experiment, features vocal by fellow Chicago rapper Saba.
Document 2: Champions (GOOD Music song): "Champions" is a collaborative song by American rappers Kanye West, Gucci Mane, Big Sean, 2 Chainz, Travis Scott, Yo Gotti, Quavo and Desiigner, released as the lead single from the upcoming GOOD Music compilation album, "Cruel Winter". The song was produced by West himself, alongside A-Trak, Lex Luger and Mike Dean, with co-production from Derek Watkins and Charlie Heat, and additional production from Noah Goldstein.
Document 3: Maybe (No Angels song): "Maybe" is a song performed by all-female German pop group No Angels. It was written and composed by Pelle Ankarberg, Niclas Molinder, Maryann Morgan, and Joacim Persson and originally recorded by American-Norwegian pop singer Trine Rein, featuring strings by violinist Andreas Ljones. An uplifting rock pop song that features a heavy guitar riff sample, it incorporates an uncredited sample of The Beatles' 1969 number-one record "Come Together", while its lyrics revolve around relationship that is built upon contingence and hesitancy.
Document 4: Angel by the Wings: "Angel by the Wings" is a song by Sia, from the Otto Bell documentary film, "The Eagle Huntress" soundtrack.
Document 5: Angel Haze discography: American rapper Angel Haze has released one studio album, one internet album, two extended plays (EPs), four mixtapes and nineteen singles (including four as a featured artist and nine promotional singles). In July 2012, after releasing two prior mixtapes, Haze released a mixtape "Reservation" online for free. The title is inspired by the act of reserving a table at a restaurant, saying "[...] For me, it's like that with the rap industry. I made my reservation there [...] and now I'm finally arriving". The lead single "New York" peaked at number 58 on the UK Singles Chart, and number 12 on the UK R&B Singles Chart. Shortly after, Haze released a commercial EP compiled of tracks from "Reservation", titled "New York", followed by a fourth mixtape, "Classick". Throughout late 2013, during the run-up to the release of the debut album, Haze released a cover of a popular song every day, for thirty days. Most famous from these freestyles was the adaptation of Macklemore and Ryan Lewis's track "Same Love", which discusses childhood, prejudice, homophobia and sexuality. The series was dubbed "30 Gold".
Document 6: Baby Blue (Action Bronson song): "Baby Blue" is a song by American rapper Action Bronson. It was released on March 3, 2015 as the fourth and final single off his second album "Mr. Wonderful" (2015). It features a guest appearance from fellow rapper Chance the Rapper. It was co-written by both artists, along with Zane Lowe (who co-wrote the chorus) and Mark Ronson, who also produced the song. A hip hop breakup song, "Baby Blue" is the closer to a three-part suite along with "City Boy Blues" and "A Light in the Addict" that's preluded by the album's interlude, "Thug Love Story 2017 The Musical".
Document 7: I Changed a Lot: I Changed a Lot is the eighth studio album by DJ Khaled. It was released on October 23, 2015, by We the Best Music Group and RED Distribution. Recording sessions took place during 2014 to 2015, with its production by Khaled, along with The Beat Bully, Lee on the Beats, Danja, Bkorn and The Mekanics, as well as guest appearances from Future, Rick Ross, Boosie Badazz, Jeezy, Chris Brown, August Alsina, Fetty Wap, Yo Gotti, Trick Daddy, French Montana, Meek Mill, Beanie Sigel, Jadakiss, Lil Wayne, Big Sean. Trey Songz, Jeremih, Ace Hood, Vado, Jay-Z, Mavado, John Legend, Usher and Fabolous.
Document 8: Angels Fall (song): "Angels Fall" is a song by American rock band Breaking Benjamin. Released soon after the album's lead single "Failure" on April 14, 2015, the track is the second single on their fifth studio album "Dark Before Dawn" and is the album's third track overall.
Document 9: Angels &amp; Ghosts: Angels & Ghosts is the fifth full-length studio album from English electronica production duo Soulsavers, released worldwide by Columbia Records 23 October 2015. It is their second collaboration with Dave Gahan, the frontman of Depeche Mode, as guest vocalist and songwriter, this time released under the moniker Dave Gahan & Soulsavers.
Document 10: Finally Famous Vol. 3: Big: Finally Famous Vol. 3: Big is the third mixtape by American rapper Big Sean. It was released as a free online download on August 31, 2010, by Kanye West's label GOOD Music. The production was handled from Sean himself, alongside his boss and label-mate Kanye West, Clinton Sparks and No I.D.; as well as the guest appearances from Bun B, Big K.R.I.T., YG, Drake, Asher Roth, Mike Posner, Tyga and Currensy, among others.
Document 11: In Colour (Jamie xx album): In Colour is the debut studio album by English producer Jamie xx, released on 29 May 2015 by Young Turks. The album was composed during a five-year period while a member of the indie pop band The xx, starting with his production on "xx" in 2009. After starting his solo career with the remix album "We're New Here" (2011) and singles like "All Under One Roof Raving" (2014), he was intent on making the album something of a departure from his previous work and genre. The album features guest vocals from fellow The xx members Romy and Oliver Sim, as well as from Young Thug and Popcaan. The album produced five singles: "Girl" and "Sleep Sound" as a double-single on 5 May 2014, "Loud Places" on 27 March 2015, "Gosh" on 4 May and "I Know There's Gonna Be (Good Times)" on 22 May.
Document 12: Purple Reign: Purple Reign is a mixtape by American rapper Future, hosted and executive-produced by DJ Esco and Metro Boomin. It was released on January 17, 2016 with an 11-hour notice via LiveMixtapes and DatPiff. It is Future's first non-commercial mixtape since the mixtape trilogy "Monster" (2014), "Beast Mode" and "56 Nights" (2015). "Purple Reign" follows the commercial collaborative mixtape "What a Time to Be Alive" with Canadian rapper Drake. The mixtape features production from frequent collaborators Metro Boomin, Southside, Zaytoven, DJ Spinz and Nard & B, among others. The cover font is a tribute to Prince's landmark 1984 album "Purple Rain", which is stylized in the same fashion.
Document 13: Coloring Book (mixtape): Coloring Book is the third mixtape by American rapper Chance the Rapper. It was produced by his group The Social Experiment, Lido, and Kaytranada, among others. For the album, Chance also collaborated with musicians such as Kanye West, Young Thug, Francis and the Lights, Justin Bieber, Kirk Franklin, and the Chicago Children's Choir.
Document 14: Angels &amp; Airwaves: Angels & Airwaves is an American rock supergroup, featuring Tom DeLonge (lead vocalist, keyboardist, bassist and guitarist) and Ilan Rubin (drummer, keyboardist, guitarist, bassist and backing vocalist). Former members are Ryan Sinn (bassist and backing vocalist), Adam "Atom" Willard (drummer), Matt Wachter (bassist, keyboardist and backing vocalist). The status of David Kennedy (guitarist and keyboardist) and Eddie Breckenridge (bassist) is currently unknown.
Document 15: Cityreal: 3-time Western Canadian Music Award nominee Cityreal has garnered a respectable amount of critical acclaim for his early mixtapes, his thought-provoking music videos, and for his hip-hop/blues fusion collaborative album Good Morning Blues. The Vancouver-based rapper/ producer has toured extensively across Canada, the United States, and Europe, winning over audiences in both clubs and at numerous festivals like the Squamish Valley Music Festival, NXNE and Canadian Music Week in Toronto, the Centre of Gravity Festival in Kelowna, the World Ski and Snowboard Festival and Crankworx Festival in Whistler, and the Shambhala Festival in Nelson. Cityreal has warmed up audiences for established names like K'Naan, Ghostface Killah, Big KRIT, Ice Cube, Tech N9ne, Three 6 Mafia, Dilated Peoples, and many more. For his upcoming project, he has collaborated with notable artists such as Rich The Kid, Saukrates, Sarah McLachlan, and many more.
ground_truth: Chicago Children's Choir