Rage Against the Machine is an American heavy metal band from Los Angeles, California.
 Formed in 1991, the group consists of rapper and vocalist Zack de la Rocha, bassist and backing vocalist Tim Commerford, guitarist Tom Morello, and drummer Brad Wilk.
 They draw inspiration from early heavy metal instrumentation, hip hop acts such as Afrika Bambaataa, Public Enemy, and the Beastie Boys, punk rock such as the Sex Pistols and Fugazi, and Dutch crossover band Urban Dance Squad.
 Rage Against the Machine is well known for the members' revolutionary political views, which are expressed in many of the band's songs.
 As of 2010, they had sold over 16 million records worldwide.
Zoetrope was an American heavy metal band from Chicago, Illinois.
 Although their sound was akin to thrash metal, the group described themselves as "Street Metal".
 The group was formed in 1976 by teenage friends Barry Stern (drums/vocals), Kevin Michael Rasofsky, aka Kevin Michael, (guitar), and Calvin "Willis" Humphrey (bass), soon to be joined by second guitarist Ken Black.
 Initially playing covers, the band soon ventured into writing their own material and released a single in 1980.
 Although undeniably a metal band, Zoetrope was also active in Chicago's hardcore punk scene, sharing bills with locals hardcore bands and hanging out at O'Banions, a Chicago punk bar (Ken Black and Barry Stern also produced the self-titled LP by Chicago-based hardcore band Life Sentence in 1986).
 Following the release of a couple of demo tapes, the group was signed to Combat Records and issued their first LP, "Amnesty", in 1985.
 In 1987, the band traveled to Los Angeles to record their follow up, "A Life of Crime", with producer Randy Burns (Megadeth, Nuclear Assault).
 During the recording sessions, Ken Black left the band and returned to Chicago to sort out substance abuse issues.
 He was replaced by Louis Svitek.
 Although Svitek appears on the album's cover, Kevin Michael later confirmed that Ken Black had finished his guitar parts before leaving Los Angeles.
 During the tour supporting "A Life of Crime", Svitek was recruited for M.O.D. by Billy Milano.
 After the tour, Barry Stern jumped ship to fellow Chicagoans Trouble.
 Kevin Michael eventually returned with a new line up for 1993's "Mind Over Splatter" but the band folded for good soon after.
March of the Saint is the first album by American heavy metal band Armored Saint.
 It was released in 1984 on Chrysalis Records and recorded with producer Michael James Jackson who previously worked for Kiss.
 The debut album yielded a minor MTV hit with "Can U Deliver", but Joey Vera and John Bush later recalled the album's recording as a frustrating and disappointing experience, explaining that Jackson's approach was much more commercial than the heavy metal sound the band had wanted.
 As Vera recalled in 2006: "At the end of the record we were very unhappy with the production, the mix, the way we worked and who we worked with.
 And the producer and our manager let us spend over ($)300,000 on our first record.
 To this day we are still in debt for that one."
Body Count is an American heavy metal band formed in Los Angeles, California, in 1990.
 The group is fronted by Ice-T, who co-founded the group with lead guitarist Ernie C out of their interest in heavy metal music.
 Ice-T took on the role of vocalist and writing the lyrics for most of the group's songs.
 Lead guitarist Ernie C has been responsible for writing the group's music.
 Their controversial self-titled debut album was released on Sire Records in 1992.
Omen is an American heavy metal band.
 The band was formed in Los Angeles, California, in 1983, by lead guitarist Kenny Powell, previously with the band Savage Grace and signed on with Metal Blade in 1984, with whom they released their debut "Battle Cry" (which contained "The Axeman", which appeared on the soundtrack for the Heavy Metal themed 2009 video game "Brütal Legend").
Jesters of Destiny is a heavy metal band from Los Angeles, California, which was formed in 1984 by Bruce Duff (bass/vocals, who had been booted from 45 Grave earlier in the year) and guitarist Ray Violet.
 Evolving from a recording project spearheaded by Violet, who was working as the house engineer for Dawnbreaker studio in San Fernando, CA (previously owned by Seals and Crofts), the band recorded what would be the first two Jesters songs during the project,which was instigated in order to come up with commercial jingles.
 The songs were "Diggin' That Grave" and "End of Time."
 The band presented the songs to Metal Blade Records, who included "End of Time" on Metal Massacre V collection.
 It closed the LP, which include early tracks by Overkill, Fates Warning, Voi Vod and Metal Church.
 The band then signed to Metal Blade, but due to the band not being strictly heavy metal, the label created a subsidiary, Dimension Records, which released the band's debut album, "Fun at the Funeral", in 1986, and an EP, "In a Nostalgic Mood", in 1987, during their first tenure.
 Following ",,"Mood,"" Metal Blade dropped the band.
 They demo-ed a number of songs for a planned third LP to be titled, "No Laughing Matter," but we're unable to land a new recording contract.
 They broke up in 1988.
 During their run, a number of lead guitarists and drummers were part of the band, including on drums, David Buzzelli (Doktor Stixx), Louie Schilling, Walin' Jennings Morgan, Dave Kuzma, Blaze; and on guitar, Sickie Wifebeater, Michael Montano and Brian Butler.
Post Mortem is the second album by the American heavy metal band Black Tide, released on August 23, 2011.
 The album was produced by Josh Wilbur and GGGarth.
 It is the band's first album to feature guitarist Austin Diaz, after the departure of Alex Nuñez in 2008.
The Iron Maidens is an American heavy metal band from Los Angeles, California.
 Formed in 2001 as an all-female tribute act to English heavy metal band Iron Maiden.
 Considered the "World's Only Female Tribute to Iron Maiden," the band currently consists of vocalist Kirsten Rosenberg, bassist Wanda Ortiz, drummer Linda McDonald, guitarist Courtney Cox, and guitarist Nikki Stringfield,
On The Turn is the second and final studio album by Irish alternative rock outfit Kerbdog, released on Fontana Records in the UK on 31 March 1997.
 It was produced by GGGarth who had previously worked with Rage Against the Machine.
L.D. 50 is the debut studio album by American heavy metal band Mudvayne.
 Released in 2000, it is the band's first release on Epic Records, following the independently released extended play, "Kill, I Oughtta".
 "L.D. 50" was coproduced by GGGarth & Mudvayne and executive produced by Steve Richards & Slipknot member Shawn "Clown" Crahan.
 The band's elaborate visual appearance resulted in increased recognition of the band and "L.D. 50" peaked at No. 85 on the "Billboard" 200.
 The album was appraised by critics for its technical and heavy style of music.

Question: The album On the Turn was produced by GGGarth, who previously worked with what American heavy metal band from Los Angeles, California, formed in 1991?
Answer: Rage Against the Machine