Question: Robert Rihmeek Williams, aka Meek Mill, appeared in the 2015 tour of which major recording artist?

full_context: Document 1: Maybach Music Group: Maybach Music Group (MMG) is a record label imprint founded by American rapper Rick Ross. Maybach Music Group albums are distributed by Atlantic Records, a division of the Atlantic Records Group. Atlantic took over distribution following the expiration of a deal with Island Def Jam. As of December 12, 2012 the labels releases are now distributed by Atlantic Records. 19 solo and 3 compilation albums have been released by Maybach Music Group, including five certified Gold albums. The label is home to artists such as Ross himself, Wale, Meek Mill, Omarion and Gunplay and Torch, among others. The label has also had 6 albums debut at #1 on the Billboard 200 such as "Deeper Than Rap", "God Forgives, I Don't", and "Mastermind" by Rick Ross, "The Gifted" and "The Album About Nothing" by Wale and "Dreams Worth More Than Money" by Meek Mill.
Document 2: Prismatic World Tour: The Prismatic World Tour was the third concert tour by American singer-songwriter Katy Perry, in support of her fourth studio album, "Prism" (2013). The tour began on May 7, 2014, in Belfast, Northern Ireland at the Odyssey Arena, concluding on October 18, 2015, in Alajuela, Costa Rica at Parque Viva after six legs. The Prismatic World Tour grossed more than $204.3 million from 149 shows with a total attendance of 1,984,503 between 2014 and 2015 and it is Perry's most successful tour to date.
Document 3: Dreams Worth More Than Money: 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.
Document 4: The Pinkprint: The Pinkprint is the third studio album recorded by Trinidadian recording artist Nicki Minaj. It was made available for purchase on December 12, 2014 by Young Money Entertainment, Cash Money Records and Republic Records. Minaj co-executive-produced the record alongside Birdman, Lil Wayne and Ronald Williams, and the assistance of a variety of fellow producers. Looking to depart from the dance-pop elements of her second studio album, "" (2012), the rapper wanted to make a follow-up record influenced by her traditional hip hop beginnings.
Document 5: Wins &amp; Losses: 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..
Document 6: The Red Tour: The Red Tour was the third concert tour by American singer-songwriter Taylor Swift. Launched in support of Swift's fourth studio album, "Red" (2012), the tour began on March 13, 2013 in Omaha, Nebraska and concluded on June 12, 2014 in Singapore.
Document 7: Loud Tour: The Loud Tour was the fourth overall and third world concert tour by Barbadian recording artist Rihanna. Performing in over twenty countries in the Americas and Europe, the tour was launched in support of Rihanna's fifth studio album "Loud" (2010) but eventually supported her following album "Talk that Talk" as it was released during the tour, in November 2011. Critics acclaimed the show for its liveliness and higher caliber of quality when compared to Rihanna's previous tours. The Loud Tour was a large commercial success, experiencing demand for an extension of shows in the United Kingdom due to popularity. In London, Rihanna played a record breaking 10 dates at The O2 Arena. The tour ultimately grossed an estimated value of US$90 million from 98 reported shows and a total audience of 1,200,800. The Loud Tour became the 7th highest grossing tour of 2011.
Document 8: Burn (Meek Mill song): "Burn" is a song by American hip hop recording artist Meek Mill, released on September 11, 2012 as the second single from his debut studio album "Dreams and Nightmares" (2012). The song features fellow rapper Big Sean and is produced by Jahlil Beats. "Burn" peaked at number 86 on the "Billboard" Hot R&B/Hip-Hop Songs chart.
Document 9: Young Thug: Jeffery Lamar Williams (born August 16, 1991), best known professionally as Young Thug, is an American hip hop artist from Atlanta, Georgia. He is known for his unconventional vocal style, fashion, and persona. He first received attention for his collaborations with fellow Southern rappers such as Rich Homie Quan, Cash Out, Shawty Lo and Gucci Mane. Young Thug initially released a series of independent mixtapes beginning in 2011 with "I Came From Nothing". In early 2013, he signed with Gucci Mane's 1017 Records, and later that year he released his label debut mixtape "1017 Thug" to critical praise.
Document 10: Dreamchasers 2: Dreamchasers 2 is a mixtape by American rapper Meek Mill (hosted by DJ Drama). It was released on May 7, 2012, by Maybach Music Group and Warner Bros. Records, and also released for digital download on DatPiff. It serves as the second installment in the "Dreamchasers" series, following "Dreamchasers" (2011). The mixtape features guest appearances from American rappers Travis $cott, Rick Ross, Fabolous, French Montana, Wale, Big Sean, Kendrick Lamar, Mac Miller, 2 Chainz and a Canadian rapper Drake – along with singing vocals by Jeremih, Trey Songz and Jordanne; as well as production that was provided by Jahlil Beats, SAP, All Star, Cardiak, Reginald Smith and Jesse Wilson, among others. The mixtape consists mostly of original material, including a remix to Meek Mill's single from his previous mixtape "Dreamchasers", "House Party", and a cover of Drake's "The Ride".
Document 11: Young &amp; Gettin' It: "Young & Gettin' It" is a song by American hip hop recording artist Meek Mill, released on October 2, 2012 as the third single from his debut studio album "Dreams and Nightmares" (2012). It features rapper/singer Kirko Bangz and was produced by Jahlil Beats.
Document 12: Meek Mill: 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.
Document 13: Last Girl on Earth: The Last Girl on Earth was the third concert tour by Barbadian recording artist Rihanna. The tour visited Europe, Asia, North America and Australia to support her fourth studio album, "Rated R" (2009). The tour was announced through MTV News in December 2009. The tour grossed over $40 million according to Trollpoll as Rihanna earned over $30 million worldwide and around $10 million in Australia. In an interview, Rihanna stated, "It's going to be a worldwide tour, so it's going to be a very long tour. We'll definitely be in your city, so look out for that." The tour received generally positive reception.
Document 14: The Pinkprint Tour: 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.
Document 15: Pink Friday: Pink Friday is the debut studio album by Trinidadian-American recording artist Nicki Minaj, released on November 22, 2010, by Young Money, Cash Money and Universal Motown. After signing a recording contract with Young Money Entertainment in 2009, Minaj began planning the album that same year and work continued into 2010. Minaj enlisted a variety of producers whose efforts resulted in a primarily hip hop record, which sees additional influences from R&B and pop music. The album features guest vocals from Eminem, Rihanna, Drake, will.i.am, Kanye West and Natasha Bedingfield.
ground_truth: Nicki Minaj