Michael Ray Roach (born April 29, 1988), best known as Michael Ray, is an American country music singer and songwriter.
 He is signed to Warner Music Nashville, for which he has released his debut single, "Kiss You in the Morning".
 The song has reached No. 1 on Country Airplay.
 Before this single's release, Ray was mentored by John Rich of Big & Rich on the singing competition "", which he won.
 He and Rich co-wrote Big & Rich's 2015 single, "Run Away with You".
Gamal "LunchMoney" Lewis (born January 11, 1988) is an American rapper, singer, songwriter and record producer.
 He is best known for his 2015 single "Bills", which topped the charts in Australia and peaked within the top ten in New Zealand and the United Kingdom.
Courtney A. Milburn, (born July 4, 1986) better known by his stage name Chedda Da Connect, is an American hip hop recording artist from Houston, Texas.
 He is best known for his 2015 single "Flicka Da Wrist" which has become one of the biggest Hip-Hop singles of 2015.
 As of September 2015, the single has been certified Gold selling over 500,000 downloads, spawned over a million memes and vine compilations, and has accumulated over 6 million YouTube views in 6 months, since being uploaded to YouTube in May, 2015.
 It peaked at number 94 on the US Billboard Hot 100 on 29, May 2015.
"Watch Me Do" is a song recorded by American singer and songwriter Meghan Trainor from her second studio album "Thank You" (2016).
 It was released on March 25, 2016, on iTunes for those who pre-ordered the album and other digital download platforms as a promotional single.
 Produced by Ricky Reed, he co-wrote the song with Trainor, Jacob Kasher Hindlin and Gamal Lewis.
Marcale Jenkins, better known by his stage name Calez, is an American rapper and record producer from Chicago, Illinois.
 He is best known for his collaborations with Chicago rappers Alex Wiley and Chance the Rapper, most notably the hit 2015 single, "Navigator Truck."
 Calez is a member of the Chicago hip-hop collective, "2000eighties."
U Got Miilk ?
 is the second studio album by American Rapper Miilkbone, released on April 17, 2001 by XCaliber Entertainment and Lightyear Entertainment.
 The album generated three non charting singles, "Yes Yes Y'all", "Dear Slim", and "A Few Good Men", all of which did not chart.
 The album is notable for its single "Dear Slim" which attacked rapper Eminem, who had previously dissed Miilkbone on his song "Just Don't Give A Fuck" with the line, "I'm Nicer than Pete, but I'm on a Serch to crush a Miilkbone I'm Everlasting, I melt Vanilla Ice like silicone".
 After learning that Miilkbone was planning to release a diss track against him Eminem was quoted as saying, "When I said 'I'm on a Serch to crush a Miilkbone,' I was talking about stereotypes and now I heard he wants to bring it, so he could bring it and look stupid, you know what im sayin'?
 I heard his shit and his shit is garbage.
 I wish it was dope enough for me to respond, but it's not, you know what i'm sayin'?"
 Eminem never responded to the song.
 This would be Miilkbone's last release until his return to rapping in 2012 and his 2015 single "Facebook Love" from his upcoming third studio album "The Voice Of Reason".
Rakim Allen (born December 9, 1991), better known by his stage name PnB Rock, is an American singer from Philadelphia, Pennsylvania.
 He is best known for his 2015 Single, "Fleek" and 2016 single, "Selfish", which has peaked at number 51 on the US "Billboard" Hot 100.
 In 2017, Rock was chosen as part of the "XXL" Freshman Class.
Theodore Jones, (born September 19, 1984) better known by his stage name Young Greatness, is an American rapper from New Orleans.
 He is best known for his 2015 single "Moolah", which peaked at number 85 on the "Billboard" Hot 100 chart.
Tyshon Dwayne Nobles (born October 27, 1990), better known by his stage name T-Wayne, is an American rapper from Houston, Texas.
 His rap name is a combination of his first name and his middle name.
 He has also occasionally taken the pseudonym Rickey Wayne, amid concerns that his name resembles those of famous rappers T-Pain and Lil Wayne.
 He is best known for his 2015 single "Nasty Freestyle" which peaked at number nine on the US "Billboard" Hot 100.
 Born in Abilene, he moved to Dallas at age 15, then to Houston at 19, where he currently lives.
 He also performed at the 2015 BET Awards.
Nez & Rio are an American record production team from Chicago, Illinois, composed of Nesbitt Wesonga, Jr. and Mario Loving.
 They are perhaps best known for producing Schoolboy Q's 2014 single "Man of the Year," as well as ASAP Rocky's 2015 single "Lord Pretty Flacko Jodye 2".
 Throughout their career they have worked with artists such as Schoolboy Q, ASAP Rocky, Vic Mensa, Tinashe, Kendrick Lamar, Ab-Soul and Chance the Rapper, as well as others from their hometown Treated Crew.

Question: Watch Me Do was co-written by the rapper who best known for what 2015 single?
Answer: Bills