WIKIPEDIA:

“ Roots is the sixth studio album by Brazilian heavy metal band Sepultura. It was released in by Roadrunner Records, and was the band's last studio album to feature founding member and vocalist Max Cavalera. Following the experimentalism of the album Chaos A.D., Roots has more influence from Brazilian musical rhythms, and features Brazilian musician Carlinhos Brown, percussionist David Silveria, turntablist DJ Lethal, and vocalists Jonathan Davis and Mike Patton.

Production
The album was produced by Ross Robinson. The majority of the themes presented on Roots are centered on Brazilian politics and culture. The concept for the album was inspired by the film At Play in the Fields of the Lord. The movie inspired Max Cavalera to travel to Mato Grosso, Brazil to visit the Xavante tribe.

Musical style and influences
The inspiration for Sepultura's new musical direction was twofold. One was the desire to further experiment with the music of Brazil, especially the percussive type played by Salvador, Bahia samba reggae group Olodum. Another innovation Roots brought was the inspiration taken from the sound of Deftones and Korn - especially the latter's debut, with its heavily down-tuned guitars.
The style of Roots incorporates elements of death metal, nu metal [......] ”

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