Question: What duo  was an American rapper and record producer apart of , who had a guest appearance in  the second album by American hip hop duo 1982 ?
Context: "Good Stuff" is a song by American R&B singer-songwriter Kelis from her debut album, "Kaleidoscope" (1999).  Written and produced by The Neptunes, the song was released as the album's second single, and features a guest appearance from American rapper Pusha T, formerly known as Terrar, one half of the hip hop duo Clipse.  The single failed to chart on the U.S. "Billboard" Hot 100 and only managed limited success in select European markets, but nevertheless became a second top twenty hit for Kelis on the UK Singles Chart, peaking at number nineteen. 2012 is the second album by American hip hop duo 1982, composed of Statik Selektah and Termanology.  Guest appearances include Mac Miller, Bun B, Shawn Stockman (of Boyz II Men), Roc Marciano, Havoc (of Mobb Deep), Freddie Gibbs, Crooked I and Lil' Fame (of M.O.P). Uptown 3000 was a Korean American hip hop duo on the record label The Machine Group CEO Alvin & Calvin Waters which consisted of Carlos Galvan aka "Cali-Mexci" and Steve Kim aka "Kwon".  The duo was a spinoff of Uptown, a Korean hip hop group which was active in the late 1990s whose sales reached 6 million.  The duo is considered defunct as the original Uptown made its comeback in Korea in 2006, which Kim and Galvan were a part of.  The group has been credited with being the first Korean hip hop group to closely resemble anything similar to American style hip hop. "HeadBand" is a song by American hip hop recording artist B.o.B.  It was released on May 21, 2013, as the lead single from his third studio album, "Underground Luxury" (2013).  The song, produced by American hip hop record producer DJ Mustard, features a guest appearance from fellow American rapper 2 Chainz.  The song has since peaked at number 53 on the Billboard Hot 100. Lawless Element is an underground hip hop duo from Detroit, Michigan.  The duo is composed of cousins Griot (West African for "Storyteller", born Alfred Austin) as emcee and Magnif (born Kavi Tapsico) as DJ, producer and emcee.  The duo of Magnif and Griot became engulfed in hip hop culture at the ages of 6 and 9, and spent their teenage years honing their skills on the production boards and on the microphone.  At the ages of 16 and 19, the duo released their first single, titled "Mic Check", in 2003 on Running Man Records.  The next year, the duo hooked up with fellow Detroit native, producer J Dilla, to release the single "The Shining".  In early 2005, LE worked with Dilla's Jaylib partner Madlib on the single "High", which landed them a deal with popular independent rap label Babygrande Records.  Their debut album, "", was released in September 2005 to generally positive reviews.  "Soundvision" featured production from Magnif, J Dilla and Madlib and guest appearances from Dilla, Melanie Rutherford, Phat Kat, Big Tone, P.Dot, SelfSays and Diverse.  "Rules Pt. 2" was the album's lead single, and also became the duo's first music video.  URB magazine gave the album 4 out of 5 stars and stated that it was "Heavily influenced by the golden age of De La Soul, Pete Rock and DJ Premier" and that it featured "12 top-shelf tracks" The album also earned the duo Featured Artist status on the Okayplayer website.  Magnif has continued production work for a number of other underground acts, and released a mixtape titled "SupaBeatMaker" in late 2005.  The duo has announced plans for their second album, tentatively titled "Evil", scheduled for released in 2008 on Babygrande Records.  Magnif is also planning the release of a full-length production and solo album. Train of Thought is the debut album of American hip hop duo Reflection Eternal, released October 17, 2000 on Rawkus Records.  Collaborating as a duo, rapper Talib Kweli and DJ and hip hop producer Hi-Tek recorded the album during 1999 to 2000, following their individual musical work that gained notice in New York's underground scene during the late 1990s.  Kweli had previously worked with rapper Mos Def as the duo Black Star, and Hi-Tek had served as producer on the duo's debut album. The discography of American rapper Big Boi consists of three studio albums, one mixtape, twenty-two singles, five promotional singles and twenty-five music videos. Big Boi initially achieved success as a member of the hip hop duo Outkast with fellow rapper André 3000; they have recorded and released six studio albums together, and their singles "Ms. Jackson", "Hey Ya! " and "The Way You Move" have all topped the US "Billboard" Hot 100.  In 1995, Big Boi made a guest appearance on the single "Dirty South" by American hip hop group Goodie Mob, which peaked at number 92 on the "Billboard" Hot 100.  During the late 1990s and early 2000s, he made several other appearances on commercially successful singles, including "All n My Grill" by rapper Missy Elliott, "A.D.I.D.A.S." by rapper Killer Mike and "Girlfight" by singer Brooke Valentine; these songs charted on the "Billboard" Hot 100. "Duffle Bag Boy" is a song by American hip hop duo Playaz Circle, released as the debut lead single from their debut album, "Supply & Demand" (2007).  The song features a guest appearance from fellow American rapper Lil Wayne and was produced by M16 and Liam Kantwill.  The song peaked in the Top 40 of the U.S. "Billboard" Hot 100, reaching number 15. The Evening News EP is the second EP by American hip hop duo 1982, composed of Statik Selektah and Termanology. Kejuan Muchita (born May 21, 1974), better known by his stage name Havoc, is an American rapper and record producer.  He was one half of the hip-hop duo Mobb Deep.
Answer: Mobb Deep