Herbert Brown, better known by his stage name McGruff (also known as Herb McGruff) is an American Hip hop recording artist from Harlem, New York City, New York.
 Brown started rapping in his early teens.
 He embarked on his music career in the hip hop group Bronx Most Wanted, alongside rappers Jay Q and Tee U.B. Brown later became a member of the hip hop collective Children of the Corn.
 As a member of Children of the Corn, Brown worked alongside Big L, Cam'ron, Bloodshed and Mase, all of whom would go on to have successful careers in the music industry.
 After the group disbanded without releasing any material, Brown made his first appearance on Big L's debut album, "Lifestylez ov da Poor & Dangerous" (1995), on the tracks "8 Iz Enuff" and "Dangerzone".
 Eventually, Brown signed a deal with popular hip hop label, Uptown Records and began recording his debut album, "Destined to Be".
 In early 1998, the album's lead single "Before We Start" became a minor hit, charting on several "Billboard" charts.
 In the Summer of 1998, "Destined to Be" was released but failed to sell many copies, only peaking at 169 on the "Billboard" 200, and Brown was released from his contract.
 Brown would make appearances with Heavy D on his album, "Waterbed Hev" and the "Woo" soundtrack.
 In 2009, Brown appeared on Mase's mixtape "I Do the Impossible".
 In 2010, he was featured heavily on The Diplomats mixtape, "The D.I.P. Agenda."
 In 2014, DJ Kay Slay, enlisted Brown, along with Raekwon, Fat Joe, Ghostface Killah, Sheek Louch, N.O.R.E., Lil' Fame, Prodigy and Rell, for a song titled "90s Flow".
EPMD is an American Hip Hop group from Brentwood, New York.
 The group's name is a concatenation of the members' names "E" and "PMD" or an acronym for "Erick and Parrish Making Dollars", referencing its members, emcees Erick Sermon ("E" a.k.a. E Double) and Parrish Smith ("PMD" a.k.a. Parrish Mic Doc).
 During an interview on college radio station WHOV in 1987, Parrish Smith stated that the name evolved from the original: "We were originally known as "EEPMD" (Easy Erick and Parrish the Microphone Doctor), but chose to go with EPMD because it was easier to say."
 He also stated that they dropped the two "E's" because N.W.A.'s Eric Wright was already using "Eazy-E" as his stage name.
 The group has been active for 31 years (minus two breakups in 1993 and 1999), and is one of the most prominent acts in east coast hip hop.
 DJ K La Boss and DJ Scratch were DJs for the group and their current DJ is DJ Diamond J
"Rattling the Keys to the Kingdom" is a single by Australian hip hop group Hilltop Hoods.
 The song is the fourth official single from their sixth album Drinking From the Sun.
 The song was announced to be the fourth single on 14 September through their official website and Facebook by posting the artwork of the single.
 They announced that the single will be released on 21 September.
 They also said that there was something big happening with Australian hip hop and that there will be more announced on the same date as the single is released.
 On the artwork there are Australian hip hop artist logos, tags and Australian hip hop labels logos which are put together to form a crown.
Cru was an American hip hop group formally signed to Def Jam Recordings composed of three members, Chadio, Mighty Ha and Yogi.
 The group's first appearance was the "We Got It Goin' On" remix by R&B group Changing Faces in 1995.
 Two years later the group released their debut album, "Da Dirty 30", which featured three singles "Just Another Case" "Pronto" and "Bubblin'".
 After the release of the album, the group disbanded with Yogi becoming a successful hip hop producer.
 After a long hiatus, Chadio resumed his career and released an album titled "Internal Insurgency" via iTunes in 2009.
The discography of Outkast, an American hip hop duo consisting of rappers André 3000 and Big Boi, consists of five studio albums, one compilation album, one soundtrack album, one video album, thirty-two singles (including eight as featured artists), three promotional singles and twenty-one music videos.
 In 1992, Outkast became the first hip hop act to be signed to the label LaFace Records; with their first studio album "Southernplayalisticadillacmuzik" (1994) that debuted at number 20 on the US "Billboard" 200.
 "Southernplayalisticadillacmuzik" spawned the commercially successful single "Player's Ball" that has reached at number 37 on the US "Billboard" Hot 100.
 It was later certified gold by the Recording Industry Association of America (RIAA).
 Their following two albums, "ATLiens" (1996) and "Aquemini" (1998), were commercially successful in the United States; both albums peaked at number two on the "Billboard" 200, and were certified double-platinum by the Recording Industry Association of America (RIAA).
 Three singles were solicited from each album; all three from "ATLiens" charted on the "Billboard" Hot 100, with "Elevators (Me & You)" peaking at number 12, making it the most successful.
 The lead single from "Aquemini", "Rosa Parks", peaked at number 55 on the "Billboard" Hot 100: two more singles, "Skew It on the Bar-B" and "Da Art of Storytellin' (Pt. 1)", were released from the album.
 In 1998, Outkast collaborated with hip hop group Goodie Mob on the single "Black Ice (Sky High)" and rapper Cool Breeze on the single "Watch for the Hook"; both singles peaked at numbers 50 and 73 on the "Billboard" Hot 100, respectively.
Warp 9, a science fiction themed electro-funk and hip hop trio, best known for their influential singles "Nunk," "Light Years Away," and "Beat Wave," ranks among the most iconic groups of the electro hip hop era.
 Described as the "perfect instance of hip hop's contemporary ramifications," Warp 9 was the brainchild of writer-producers Lotti Golden and Richard Scher.
 The duo wrote and recorded under the moniker Warp 9, a production project at the forefront of the electro movement.
 Warp 9 evolved from a studio concept into a band when Prism Records expressed interest in releasing Nunk as a single.
 Golden & Scher invited drummer Chuck Wansley and percussionist Boe Brown to perform the male vocals and rhymes.
 Later, a female vocalist was added to the group; Ada Dyre performed vocals and rhymes for Warp 9's second single, "Light Years Away."
 The group released two albums, "It's a Beat Wave" (1983), (Island Records), a street themed testament exploring the topics of science fiction, hip hop and mixing, and "Fade In, Fade Out" (Motown), (1986), a soul R&B oriented montage.
 Warp 9's image is best described on the cover of their 12" single "Light Years Away," with Milton (Boe) Brown (Warp 9's lead singer), Chuck Wansley and session singer Ada Dyer in their trademark sci-fi space suits.
"Symphony 2000" is the lead single released from EPMD's sixth album, "Out of Business".
 The song was produced by Erick Sermon and featured verses from EPMD's labelmates, Method Man & Redman and Lady Luck.
 "Symphony 2000" was EPMD's last charting single making it to the R&B and rap charts.
R.A.C.L.A. (an abbreviation of Rime Alese Care Lovesc Adânc - Handpicked Rhymes with a Deeper Meaning) is a Romanian hip hop group, founded in 1993 in Bucharest.
 Initially consisting of brothers Călin "Rimaru" Ionescu and Daniel "Clonatu'" Ionescu, the group released the first Romanian hip hop album in 1995 on Kromm Studio, an independent record label.
 One of first and most critically acclaimed hip hop acts in Romania, it has been through numerous personnel changes after Clonatu's departure from the group in 1998, with Rimaru remaining the sole constant member throughout the years.
 Originally known among its fans as a hardcore and political rap group, they would later gain a larger fan base in their native Romania following their collaboration with pop singer Anda Adam in 1999.
 In the mid and late 1990s, R.A.C.L.A. also gained notoriety for their involvement in a violent conflict with gangsta rap group B.U.G. Mafia and some of their affiliates at the time, such as La Familia and Il-Egal.
 The dispute initially produced a number of diss tracks from both sides and would later lead to physical altercations between members of the groups.
 While never officially announcing their hiatus, the group became largely inactive for a number of years following the release of their fifth album in 2005 and group member Connect-R's departure in 2006.
 Rimaru made a number of infrequent appearances as a solo artist and, as of 2014, has returned to performing under the group name, while also recruiting DJ GreWu, DJ Semplaru and rappers EyeKon and later TKE and Boka, as touring members of R.A.C.L.A.
G-Unit (short for Guerrilla Unit) is an American hip hop group originating from South Jamaica, Queens, New York, formed by longtime friends and East Coast rappers 50 Cent, Tony Yayo and Lloyd Banks.
 The group released their debut album "Beg for Mercy", in 2003, which went on to sell over 2,000,000 copies in the US and was certified Double Platinum by the Recording Industry Association of America (RIAA).
 The album, which followed the critical and commercial success of 50 Cent's major-label debut "Get Rich or Die Tryin'", served as a platform for Lloyd Banks, Young Buck and Tony Yayo to release their respective solo debut albums; "The Hunger for More" (2004), "Straight Outta Cashville" (2004) and "Thoughts of a Predicate Felon" (2005).
 In 2008, the group released their second album "T·O·S (Terminate on Sight)".
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.

Question: What American Hip Hop group released its sixth lead single "Symphony 2000", from the album "Out of Business"?
Answer: "Erick and Parrish Making Dollars"