Question: Tauheed Epps appeared on which rapper's mixtape Droptopwop?
Context: Mixtape Messiah is a series of mixtapes by Houston rapper Chamillionaire. " The Mixtape Messiah" was his first in the series, which was released on February 15, 2004.  Featuring 61 tracks over three CDs, this triple mixtape is the longest and most bought mixtape in Texas history. " Mixtape Messiah 7" was released on August 4, 2009, and was officially confirmed to be the final mixtape in the series. Bang, Pt. 2 is a self-released mixtape by American hip hop recording artist Chief Keef.  The mixtape is produced by a variety of producers including Zaytoven and Tarentino.  It was hosted by DJ Holiday, Mike Epps and comedian Michael Blackson.  It was released on August 15, 2013 as a follow up to his 2011 mixtape, "Bang".  "Bang, Pt. 2" is itself a predecessor to Keef's third album, "Bang 3". 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. "Double Tap" is a song recorded by American singer-songwriter Jordin Sparks, featuring Atlanta based rapper 2 Chainz.  The song was released by Louder Than Life & Sony Music on March 3, 2015, as the lead single from Sparks' third studio album "Right Here Right Now" (2015).  The song was written by Victoria Monét McCants, Thomas "Tommy" Parker Lumpkins & Tauheed Epps and Jonas Jeberg, with the latter also producing the track. Purple Reign is a mixtape by American rapper Future, hosted and executive-produced by DJ Esco and Metro Boomin.  It was released on January 17, 2016 with an 11-hour notice via LiveMixtapes and DatPiff.  It is Future's first non-commercial mixtape since the mixtape trilogy "Monster" (2014), "Beast Mode" and "56 Nights" (2015).  "Purple Reign" follows the commercial collaborative mixtape "What a Time to Be Alive" with Canadian rapper Drake.  The mixtape features production from frequent collaborators Metro Boomin, Southside, Zaytoven, DJ Spinz and Nard & B, among others.  The cover font is a tribute to Prince's landmark 1984 album "Purple Rain", which is stylized in the same fashion. Tauheed Epps (born September 12, 1977), known professionally as 2 Chainz (formerly Tity Boi), is an American rapper, record producer, songwriter, actor, entrepreneur, businessman, investor, philanthropist, and activist.  Born and raised in College Park, Georgia, he initially gained recognition for being one-half of the Southern hip hop duo Playaz Circle, alongside his longtime friend and fellow rapper Earl "Dolla Boy" Conyers.  They are perhaps best known for being signed to fellow Georgia-based rapper Ludacris' Disturbing tha Peace label, as well as their debut single "Duffle Bag Boy". Mr. Davis is the eleventh studio album by American rapper Gucci Mane.  It will be released on October 13, 2017, by GUWOP Enterprises and Atlantic Records.  It is Gucci Mane's second commercial project of the year following the "Droptopwop" (2017) mixtape.  The album features guest appearances from Nicki Minaj, Monica, Chris Brown, Migos, The Weeknd, ASAP Rocky, Big Sean, Ty Dolla Sign, Schoolboy Q, among others. Droptopwop is a collaborative commercial mixtape by American rapper Gucci Mane and record producer Metro Boomin.  It was released on May 26, 2017 by Atlantic Records and 1017 Records to celebrate Gucci Mane's one year anniversary since being released from prison.  The entire album is produced by Metro Boomin, along with extra production from Southside, London on da Track, DJ Spinz and Cubeatz.  It features guest appearances from American rappers Offset, 2 Chainz, Young Dolph and Rick Ross. King Koopa: The Mixtape Messiah is a mixtape by Houston rapper Chamillionaire.  It was released on  15, 2004 (2004--) .  The tape featuring 61 tracks over three CDs, this triple album is the longest and most bought mixtape in Texas history.  It is the first mixtape in the Mixtape Messiah series.  The mixtape established Chamillionaire as one of the premier artists in the Southern rap music industry at the time of its release and was the pivotal mixtape that developed his fan base and ability to obtain mainstream success with the release of "The Sound of Revenge" years later. Summer Knights is the second mixtape by American rapper Joey Bada$$.  It was released on July 1, 2013, by Cinematic Music Group.  The mixtape was planned to be released as an EP, to prelude the release of his debut album "B4.DA. $$", but instead it was announced to be a full-length mixtape.  The mixtape features production from Chuck Strangers, Kirk Knight, MF Doom, Statik Selektah, DJ Premier, Lee Bannon, Oddisee, Navie D, and Bruce Leekix.  The mixtape features more original instrumentals than his first mixtape "1999" which was primarily samples.
Answer: Gucci Mane