Question: How many copies did the best selling album by Sepultura sell ?

full_context: Document 1: Korn III: Remember Who You Are: Korn III: Remember Who You Are is the ninth studio album by the American nu metal band Korn, released on July 13, 2010. Unlike Korn's following albums, the album was recorded as a four-piece band and using no Pro Tools or editing. Vocalist Jonathan Davis stated that the album is "simple" due to the absence of the multi-layered effect present in the band's other albums; Davis added that, the album is "about the vibe." The album features a return to their roots. The band hired producer Ross Robinson, who had produced Korn's first two albums, while drummer Ray Luzier was appointed a permanent member of the band (Luzier was formerly a "fill-in" drummer).
Document 2: List of songs recorded by Korn: Korn is an American alternative metal band from Bakersfield, California. Formed in 1993, the band originally featured vocalist Jonathan Davis, guitarists James "Munky" Shaffer and Brian "Head" Welch, bassist Reginald "Fieldy" Arvizu, and drummer David Silveria. The current lineup of the group includes drummer Ray Luzier, who replaced Silveria in 2009. The band released its self-titled debut album "Korn" in 1994, which was produced by Ross Robinson and featured equal songwriting credits for the whole band. "Life Is Peachy", released in 1996, included two cover versions – of Ice Cube's "Wicked" and War's "Lowrider", while the band's third album "Follow the Leader" featured collaborations with Limp Bizkit's Fred Durst ("All in the Family") and rappers Ice Cube ("Children of the Korn") and Slimkid3 ("Cameltosis").
Document 3: Sepultura discography: The following is the discography of Sepultura, a Brazilian heavy metal band. Sepultura was formed in Belo Horizonte, Minas Gerais, in 1984 by brothers Max and Igor Cavalera. After several lineup changes, Paulo Jr. and Jairo Guedz became permanent members for the band's first studio album "Morbid Visions", released in 1986 through Cogumelo Records. Guitarist Jairo Guedz left Sepultura following the band's first tour and was replaced by Andreas Kisser. With the new lineup, Sepultura recorded "Schizophrenia" in 1987. "Beneath the Remains", the first album from the band's contract with Roadrunner Records, was released in 1989, followed by "Arise" in 1991 and "Chaos A.D." in 1993. Sepultura's best-selling album "Roots", was released in 1996 and debuted at number 27 on the "Billboard" 200.
Document 4: We've Come for You All: We've Come for You All is the ninth studio album by American thrash metal band Anthrax. It was released on May 6, 2003 through Nuclear Blast in Europe and Sanctuary Records in North America. This was the first Anthrax record to feature Rob Caggiano on lead guitar and their final studio album with John Bush on vocals. The album was recorded over one-year span at the BearTracks Recording Studio in Suffern, New York. The cover art was designed by comic book artist Alex Ross, while the production was handed by Scrap 60 Productions team. The Who vocalist Roger Daltrey and Pantera guitarist Dimebag Darrell made guest appearances on the album.
Document 5: Metallica discography: The following is the discography of Metallica, a Los Angeles-based metal band formed in 1981 by James Hetfield (lead vocals, rhythm guitar) and Lars Ulrich (drums). After several bassist and lead guitarist changes, the band settled on Cliff Burton and Kirk Hammett, respectively. Metallica started playing locally, releasing their first widely circulated demo, "No Life 'til Leather", in 1982. The demo caught the attention of Johny Zazula, who signed Metallica to Megaforce Records. The band released "Kill 'Em All" in 1983, and the following year they released "Ride the Lightning". After "Ride the Lightning" was released, Metallica left Megaforce and signed to Elektra Records. In March 1986, the band released its third studio album, "Master of Puppets", which was Metallica's first album to be certified gold by the Recording Industry Association of America (RIAA). While promoting the album, Burton was killed in a bus accident. Jason Newsted was hired as a replacement. The band's first release to feature the new member was "," and then followed by "...And Justice for All" in August 1988, which peaked at number six on the "Billboard" 200.
Document 6: Killer Be Killed: Killer Be Killed is an American heavy metal supergroup founded by The Dillinger Escape Plan vocalist Greg Puciato and Soulfly, Cavalera Conspiracy and ex-Sepultura frontman Max Cavalera in early 2011. The lineup also features Mastodon bassist and co-vocalist Troy Sanders and Converge drummer Ben Koller. The band had slowly been working on material before announcing its name in October 2013, along with their signing to Nuclear Blast. The group's self-titled debut record was released on May 13, 2014. As of August 2017 they have sold more than 11,000 Records.
Document 7: Soulfly: Soulfly is an American heavy metal band formed in 1997 and based in Phoenix, Arizona. The original lyrical content revolved around spirituality, political and religious themes, with later albums encompassing other themes including war, violence, aggression, slavery, hatred and anger. Soulfly is led by former Sepultura frontman Max Cavalera, who formed the band after he left the Brazilian group in 1996. To date the band has released ten studio albums, one tour EP, twenty-three singles, one video album, and twelve music videos. Their debut album, "Soulfly", was released on April 21, 1998, while their newest album, "Archangel", was released on August 14, 2015. In a interview with Max in 2015, the name Soulfly is taken from the song "Headup" of Deftones.
Document 8: Roots (Sepultura album): Roots is the sixth studio album by Brazilian heavy metal band Sepultura. It was released in Europe on  20, 1996 (1996--) and in the U.S. three weeks later on March 12 by Roadrunner Records. It is the band's last studio album to feature founding member and vocalist/rhythm guitarist Max Cavalera. Following the shift to slower tempos and Latin-tinged rhythms on the album "Chaos A.D.", "Roots" delves even further into Brazilian musical textures and features significant contributions from Brazilian musician Carlinhos Brown, who guided and arranged the sections throughout the album that feature ensemble percussion playing. The song "Lookaway" also features guest appearances by Korn vocalist Jonathan Davis, former Korn drummer David Silveria, former Limp Bizkit turntablist DJ Lethal, and Faith No More/Mr. Bungle/Tomahawk/Fantômas vocalist Mike Patton. The album draws influence from the then-surging nu metal movement, specifically Korn (whose first two albums were also produced by Ross Robinson) and Deftones. (After leaving the band, Max Cavalera would continue to pursue the nu metal and "world" stylings of "Roots" with his solo project Soulfly.) Since its release, "Roots" has sold over 2 million copies worldwide.
Document 9: Derrick Green: Derrick Leon Green (born January 20, 1971) is an American musician, best known as the singer of Brazilian heavy metal band Sepultura. He joined the band in 1997 after the departure of group founder Max Cavalera.
Document 10: Blood-Rooted: Blood-Rooted is an album by Sepultura, released on June 3, 1997. It was a collection of unreleased tracks, b-sides, remixes, and live recordings. It was also the last officially recognised Sepultura album featuring original singer Max Cavalera, who left in December 1996 amid a dispute regarding the band's management. Cavalera was replaced by American singer Derrick Green in 1997.
Document 11: Against (album): Against is the seventh studio album by the Brazilian metal band Sepultura, released in 1998 through Roadrunner Records. It is the band's first release with new frontman Derrick Green, who replaced group founder Max Cavalera in 1997.
Document 12: Slayer discography: Slayer is an American thrash metal band formed in 1981 by guitarists Kerry King and Jeff Hanneman, who recruited vocalist and bassist Tom Araya, and drummer Dave Lombardo. Slayer's first two albums, "Show No Mercy" (1983) and "Hell Awaits" (1985), which were released on Metal Blade Records, did not chart in the United States. The band was then signed to Def Jam Recordings by Rick Rubin, who produced "Reign in Blood" (1986). The album helped Slayer break into the "Billboard" 200 for the first time, peaking at number 94. After "South of Heaven" (1988), Slayer signed to Rubin's new label, Def American, and released "Seasons in the Abyss" (1990). After the album was released, Lombardo departed Slayer and was replaced by Paul Bostaph.
Document 13: Max Cavalera: Massimiliano Antonio "Max" Cavalera (] , born August 4, 1969) is a Brazilian singer, guitarist, and songwriter who currently plays in heavy metal bands Soulfly, Cavalera Conspiracy, and Killer Be Killed. In 1984, he co-founded the acclaimed heavy metal band Sepultura with his brother Igor Cavalera and was the band's lead singer and rhythm guitarist until he left in 1996. Cavalera was also involved in a short-lived side project called Nailbomb.
Document 14: Live in São Paulo (Sepultura album): Live In São Paulo is the second live album by Brazilian heavy metal band Sepultura. All the tracks were recorded on April 3, 2005, at a concert in São Paulo, Brazil. A DVD was also filmed at the show. The performance of "Refuse/Resist" was released as the single for the album. Both were released on November 8, through SPV Records. The album and DVD are the second time that fans can hear singer Derrick Green perform Max Cavalera-era Sepultura songs on an official release. A live version of "Roots Bloody Roots" featuring Green was released as a bonus track on "Nation".
Document 15: Roots (Sepultura album): Roots is the sixth studio album by Brazilian heavy metal band Sepultura. It was released in Europe on  20, 1996 (1996--) and in the U.S. three weeks later on March 12 by Roadrunner Records. It is the band's last studio album to feature founding member and vocalist/rhythm guitarist Max Cavalera. Following the shift to slower tempos and Latin-tinged rhythms on the album "Chaos A.D.", "Roots" delves even further into Brazilian musical textures and features significant contributions from Brazilian musician Carlinhos Brown, who guided and arranged the sections throughout the album that feature ensemble percussion playing. The song "Lookaway" also features guest appearances by Korn vocalist Jonathan Davis, former Korn drummer David Silveria, former Limp Bizkit turntablist DJ Lethal, and Faith No More/Mr. Bungle/Tomahawk/Fantômas vocalist Mike Patton. The album draws influence from the then-surging nu metal movement, specifically Korn (whose first two albums were also produced by Ross Robinson) and Deftones. (After leaving the band, Max Cavalera would continue to pursue the nu metal and "world" stylings of "Roots" with his solo project Soulfly.) Since its release, "Roots" has sold over 2 million copies worldwide.
ground_truth: over 2 million copies worldwide