Question: Robert Rihmeek Williams, aka Meek Mill, appeared in the 2015 tour of which major recording artist?
Context: "Monster" is a song recorded by American rapper Meek Mill.  It was released on March 3, 2015 but failed to make on the final track list of Meek Mill's second studio album, ""Dreams Worth More Than Money"" so the song was downgraded to a promotional single for the album.  The song was produced by Jahlil Beats. Jordan Evans (born January 22, 1991), is a multi-platinum selling Canadian hip hop and R&B producer from Toronto, Ontario.  His production resume includes working with major recording artists such as Jay Z, Eminem, Drake, Lil Wayne, Young Jeezy, Bun B, Big Sean, Meek Mill, Tyga, Kirko Bangz, Marsha Ambrosius, and Childish Gambino.  In June 2014, Eminem's 'Not Afraid' (produced by Jordan Evans) was certified Diamond by the RIAA, surpassing 10 million records sold threshold.  The Instrumental for Drake's Single 'Pound Cake' (produced by Jordan Evans) spawned a series of remixes and freestyles by many artists including Raekwon, Lupe Fiasco, the LOX, Meek Mill, Skeme and Childish Gambino to name a few.  Jordan Evans has been nominated for multiple Grammy Award's and Juno Award's as a songwriter and record producer, and he is a member of The Recording Academy. "All Eyes on You" is a song by American hip hop recording artist Meek Mill, released as the first single from his second studio album "Dreams Worth More Than Money", on June 26, 2015.  The song features Trinidadian rapper, recording artist Nicki Minaj with additional vocals from American recording artist Chris Brown.  It was produced by Danny Morris, Alex Delicata, and co-produced by The Monarch, Kevin Cossom and DJ Khaled. "R.I.C.O." is a song by American hip hop recording artist Meek Mill, released as the third single from his second studio album "Dreams Worth More Than Money", on June 29, 2015.  The song features fellow rapper, Canadian recording artist Drake.  The song was produced by Vinylz, Allen Ritter and Cubeatz.  The song's title refers to the "Racketeer Influenced and Corrupt Organizations" Act. Wins & Losses is the third studio album by American rapper Meek Mill.  The album was released on July 21, 2017, by Maybach Music Group and Atlantic Records Group.  It is the follow-up to Meek Mill's second album "Dreams Worth More Than Money" (2015) and his "Meekend Music" EP series.  It includes guest appearances from Rick Ross, Future, Quavo, Young Thug, Lil Uzi Vert, Chris Brown, Ty Dolla Sign, Yo Gotti and The-Dream, among others.  Production derives from Meek Mill's first signed Dreamchaser producer Papamitrou, Streetrunner, DJ Mustard, Street Symphony, Wheezy, Maaly Raw, Dougie, and Honorable C.N.O.T.E.. Matthew Raymond Burnett (born July 24, 1991), is a multi-platinum selling Canadian hip hop and R&B producer from Toronto, Canada.  Burnett has worked with a number of major recording artists including: Eminem, Drake, Lil Wayne, Young Jeezy, Bun B, Big Sean, Meek Mill, Tyga, Marsha Ambrosius, Nicki Minaj and Childish Gambino.  Matthew Burnett has been the recipient of two Grammy Award nominations and two Juno Award nominations for some of his work. Dreams Worth More Than Money is the second studio album by American rapper Meek Mill.  It was released on June 29, 2015, by his record label Dream Chasers Records, distributed by Maybach Music Group and Atlantic Records.  It was initially scheduled for release on September 9, 2014, however, it has been delayed few times due to Meek Mill's revoking of his probation on July 11, 2014, thus sentencing him to jail for 3 to 6 months.  The album made its entry at number one on the US "Billboard" 200; and sold 246,000 album-equivalent units in its first week, with 215,000 coming from traditional album sales, marking as Meek's first number-one album on the chart.  Due to the change in the tracking week by Nielsen Music SoundScan, its first week sales were counted towards its second week on the charts.  At the 2016's "Billboard" Music Awards, the album won an award for Top Rap Album. "Bad Ass" is a song by American rapper Kid Ink.  The song features American rappers Meek Mill and Wale, and appears on Kid Ink's EP "Almost Home".  The original version of the song appeared on Kid Ink's 2012 mixtape "Rocketshipshawty", and contained no verses from Meek Mill and Wale.  The song is produced by Devin Cruise and was released on January 22, 2013.  It has since peaked at #90 on the "Billboard" Hot 100 and #27 on the Hot R&B/Hip-Hop Songs chart. The Pinkprint Tour was the third concert tour by Trinidadian recording artist Nicki Minaj in support of her third studio album, "The Pinkprint" (2014).  The tour was officially announced a week before the album's release, on December 8, 2014.  The tour began on March 16, 2015 in Stockholm, Sweden and concluded on August 23, 2015 in Wantagh, New York, finishing with a total of fifty shows over the span of 5 months.  The first European leg of the tour was supported by Trey Songz and Ester Dean and received mixed to positive reviews from critics, while the second North American leg was supported by Meek Mill, Rae Sremmurd, Tinashe, and Dej Loaf.  The Pinkprint Tour grossed $22 million from 38 shows. Robert Rihmeek Williams (born May 6, 1987), better known by his stage name, Meek Mill, is an American hip hop recording artist.  Raised in Philadelphia, he embarked on his music career as a battle rapper, and later formed a short-lived rap group, The Bloodhoundz.  In 2008, Atlanta-based rapper T.I. signed Meek Mill to his first record deal.  In February 2011, after leaving Grand Hustle Records, Mill signed with Miami-based rapper Rick Ross's Maybach Music Group (MMG).  Mill's debut album, "Dreams and Nightmares", was released in 2012 under MMG and Warner Bros.  Records.  The album, preceded by the single "Young & Gettin' It", debuted at number two on the U.S. "Billboard" 200.
Answer: Nicki Minaj