They Forgot is a mixtape by American hip hop recording artist Lil Durk.
 It was released on November 26, 2016, by Only the Family.
 The mixtape features guest appearances from Lil Reese, Meek Mill, Mozzy, OTF Ikey, 21 Savage, Hypno Carlito, Dej Loaf, YFN Lucci, and BJ the Chicago Kid.
 While the production was handled by C-Sick, ChopSquad DJ, Donis Beats, DP Beats, LeekeLeek, Kid Wonder, London on da Track, TY Made It, and Young Chop.
 The mixtape is supported by the single "Baller".
Bang is a self-released mixtape by American hip hop recording artist Chief Keef.
 The mixtape was hosted by DJ Hustlenomics and was primarily produced by DJ Kenn.
 It features guest appearances from Lil Reese, Fredo Santana, and SD.
 It was released on October 11, 2011 and is a predecessor to Keef's Bang, Pt. 2.
 This mixtape helped make Keef known in the Chicago area and led to his rise to fame in 2012.
Chocolate Factory is the fifth studio album by the American R&B recording artist R. Kelly, released on February 18, 2003 by Jive Records.
 Recording sessions for the album took place mainly at Rockland Studios and Chicago Recording Company in Chicago.
 It was primarily written, arranged, and produced by R. Kelly.
 "Chocolate Factory" was conceived by Kelly amid controversy over his sex scandal at the time.
Age Ain't Nothing but a Number is the debut studio album by American R&B recording artist Aaliyah, released under Jive and Blackground Records on May 24, 1994, in the United States.
 After being signed by her uncle Barry Hankerson, Aaliyah was introduced to recording artist and producer R. Kelly.
 He became her mentor, as well as the lead songwriter and producer of the album.
 The duo recorded the album at the Chicago Recording Company in Chicago, Illinois.
 The album featured two hit singles, including the top ten-charting "Back & Forth" and "At Your Best (You Are Love)"; both singles were certified Gold by the Recording Industry Association of America (RIAA).
 One additional single followed in the US: "Age Ain't Nothing but a Number".
 Two more singles were released internationally after "Age Ain't Nothing But a Number": "Down with the Clique" and "The Thing I Like".
Merry Christmas Lil' Mama is a collaborative Christmas mixtape by R&B singer Jeremih and hip hop recording artist Chance the Rapper.
 It is the fourth mixtape by Jeremih, and the fourth mixtape by Chance the Rapper.
 The mixtape was self-released via SoundCloud on December 22, 2016, and features collaborations with Hannibal Buress, King Louie, Noname, Lud Foe, and Teddy Jackson.
 The mixtape is dedicated to the city of Chicago.
HitIt!
 Recordings was an independent record label established in 1994 by artist manager/record producer Ken Waagner as an in house label at the Chicago Recording Company.
Piracy Funds Terrorism Volume 1, usually referred to simply as Piracy Funds Terrorism, is a mixtape produced by British recording artist M.I.A. and American DJ Diplo featuring vocal tracks intended for M.I.A.'s debut album "Arular" mashed up with samples of other recordings.
 The mixtape was produced by the two artists at Diplo's home studio in Philadelphia, Pennsylvania.
 It was not officially released, but was distributed at M.I.A.'s live shows and via the internet to promote the release of her much-delayed debut album.
 Despite its unofficial status, the mixtape received general acclaim among critics.
 Several music publications included the mixtape in their listings of the best albums of 2004.
Durk Banks (born October 19, 1992), better known by his stage name Lil Durk, is an American hip hop recording artist and singer-songwriter from Chicago, Illinois.
 He is the leader of his own collective, OTF (abbreviated for "Only the Family"), and is also signed to Def Jam Recordings.
What a Time to Be Alive is a collaborative commercial mixtape by Canadian recording artist Drake and American recording artist Future.
 It was released on September 20, 2015, by Young Money Entertainment, Cash Money Records, Epic Records, Republic Records, A1 Records, OVO Sound, and Freebandz.
 "What a Time to Be Alive" was supported by Drake and Future's previous collaboration on the single "Where Ya At".
 As friends, they originally planned to record a mixtape together earlier in the year; the project never fully materialized.
 However, during recording sessions for "Where Ya At", the duo began working on the project, beginning in July.
 The mixtape was extensively produced by Metro Boomin, as well as also being produced by Southside, Boi-1da and 40, among others.
 It was released on the iTunes Store and Apple Music, and debuted at number one on the US "Billboard" 200.
Friday Night Freestyles is a mixtape by American recording artist Fabolous.
 It is hosted by DJ Clue?
 and features guest appearances from Joe Budden, Jadakiss, Noreaga, Paul Cain and Stack Bundles.
 The mixtape full of freestyles on classic 90's themed instrumentals that he has been releasing three months on his "Friday Night Freestyles" series.
 Due to the success of the freestyles, Fabolous decided to put it all in one mixtape.
 The mixtape includes, eleven previously released freestyles and four additional songs.

Question: Who is the Chicago recording artist's mixtape "They Forgot" by?
Answer: Lil Durk