Emancipation Oak is a historic tree on the campus of Hampton University in what is now the City of Hampton, Virginia in the United States.
 The large sprawling oak is 98 feet (30 m) in diameter, with branches which extend upward as well as laterally.
 It is designated one of the 10 Great Trees of the World by the National Geographic Society and is part of the National Historic Landmark district of Hampton University.
 The tree is a southern live oak ("Quercus virginiana").
Cordell Jerome Taylor (born December 22, 1973) is a former American football player.
 Born in Norfolk, Virginia, Taylor attended Hampton University.
 During his short NFL career he was a member of the Jacksonville Jaguars, Seattle Seahawks, and Chicago Bears, though he never played for Chicago.
 He also played in the Canadian Football League.
 He is currently a defensive backs coach at his alma mater, Hampton University.
Phenix High School was a school for African Americans.
 It was created by the Hampton Institute, now Hampton University, as a normal school near the town of Hampton and Fort Monroe in Elizabeth City County, Virginia in 1931.
The Battle of the Bay between the Hampton Pirates and the Norfolk State State Spartans is a yearly rivalry match-up in football between two HBCUs in the state of Virginia.
 Private Hampton University and public Norfolk State University are both located in the Hampton Roads region of coastal Virginia.
 The two schools are located, respectively, in Hampton, Virginia and Norfolk, Virginia, across the James River from each other.
 As the name of the rivalry suggests, the James River empties into the Chesapeake Bay just downstream.
Mikely Adam, better known by his stage name Mike Free, is an American record producer and songwriter from South Central, Los Angeles.
 While attending Hampton University in Virginia, Free began working with DJ Mustard, who introduced him to Los Angeles- based artists including YG and Ty Dolla $ign.
 Free's first success came via his production work on Tyga's "Rack City," which was certified 4 times platinum by the Recording Industry Association of America (RIAA).
Dijon Isaiah McFarlane (born June 5, 1990), professionally known as DJ Mustard, is an American rapper, singer, songwriter, record producer, record executive, actor, and DJ from Los Angeles, California.
 He is a frequent collaborator of Compton-bred rapper YG, and has produced numerous singles for hip hop and R&B artists since his entrance into mainstream music in 2011.
 Mustard's production style has been described as an up-tempo, club oriented, catchy yet rudimentary melodic hip hop style.
 This style has snowballed into the contemporary production style of West Coast hip hop during the early 2010s, which he calls "ratchet music".
 Almost all of his productions begin or end with the tag "Mustard on the beat, hoe!"
, a voice sample of YG, who says it at the end of "I'm Good", one of their early collaborations, as well as claps and repetition of the word "hey".
 Mustard's debut album, "10 Summers", was released on August 26, 2014.
The Hampton Pirates men's basketball team is the basketball team that represents Hampton University in Hampton, Virginia, United States.
 The school's team currently competes in the Mid-Eastern Athletic Conference.
 The 2001 Hampton team is one of seven 15th seeds to have upset a 2nd seed in the NCAA Men's Division I Basketball Championship after defeating Iowa State.
Lloyd Carter (born 1958) is the Head Coach at Hampton University's Men's Lacrosse Program, retired Deputy Chief from the Baltimore City Fire Department and former president of the Vulcan Blazers, a black fraternal organization of firefighters in Baltimore, Maryland.
 He recently was made head coach of the Hampton University Lacrosse team which is now Division I.
 This is the only team playing in Division 1 at a HBCU.
 and is also a retired officer from the military reserve.
Linguang Tang is a Professor of Physics at the School of Science at the Hampton University, Hampton, Virginia, holding a joint position as faculty at Hampton and as Staff Scientist at the Thomas Jefferson National Accelerator Facility.
 He completed his B.A. in 1977 from Beijing Polytechnic University, Beijing, China, M.S. 1981, from the Institute of High Energy Physics, the Chinese Academy of Science and Technology, Beijing, China, and PhD in 1987, from the University of Houston, Houston, TX, with Prof. Ed V. Hungerford III.
 His research group is one of the leading groups in the nation in the area of experimental Hypernuclear physics, with mostly retaining leadership (Spokesperson/co-Spokesperson) roles on virtually all hypernuclear experiments (eg E89-009, E01-011, E02-017, E05-115/E08-002) at the Hall C or (E08-012/PR10-001) to be conducted in Hall A at the CEBAF accelerator.
Crenshaw is the eighth official mixtape by American rapper Nipsey Hussle.
 The mixtape was released as a free digital download on October 8, 2013, on mixtape hosting websites.
 It was also released in a limited first edition of 1,000 copies for $100 each including other incentives via his All Money In record label.
 The mixtape features production by The Futuristiks, 1500 or Nothin', 9th Wonder, DJ Dahi, Mike Free, Ralo, Wizzo and Jiggy Hendrix, among others.
 Guest appearances on the mixtape came from Rick Ross, Dom Kennedy, Slim Thug, James Fauntleroy II, Z-Ro, Skeme and Sade among others.
 The mixtape was supported by the singles "Checc Me Out" featuring Dom Kennedy and Cobby Supreme, "U See Us", "The Weather" featuring Rick Ross, "If U Were Mine" featuring Fauntleroy, and "1 of 1".

Question: Mike Free worked with the collaborator of what Compton-based rapper in his days at Hampton University?
Answer: YG