Roots of Matt Heafy

Adam Nergal Darski, often referred to by his stage name Nergal, is a Polish musician, best known as the frontman of the extreme metal band Behemoth.

Behemoth is a Polish blackened death metal band from Gdańsk, formed in 1991. They are considered to have played an important role in establishing the Polish extreme metal underground with Vader and Hate.

Slipknot is an American heavy metal band formed in Des Moines, Iowa, in 1995 by percussionist Shawn Crahan, vocalist Anders Colsefni and bassist Paul Gray. After several lineup changes in its early years, the band settled on nine members from 1999 until Gray's death in 2010: Crahan, Gray, Joey Jordison, Craig Jones, Mick Thomson, Corey Taylor, Sid Wilson, Chris Fehn, and Jim Root. Slipknot is well known for its attention-grabbing image, aggressive style of music, and energetic and chaotic live shows.

Murderdolls was an American rock band formed in Hollywood, California in 2002. Its lineup consisted of core members Wednesday 13 and Joey Jordison while former touring members included Ben Graves, Acey Slade, Eric Griffin and Tripp Eisen.

Machine Head is an American heavy metal band from Oakland, California. The band was formed in 1991 by vocalist/guitarist Robb Flynn, who remains the only original member of the band. Machine Head's aggressive musicianship made it one of the pioneering bands in the new wave of American heavy metal. Its current lineup comprises Flynn, bassist Jared MacEachern, drummer Matt Alston and guitarist Reece Scruggs. Bassist Adam Duce, guitarists Logan Mader, Ahrue Luster, Phil Demmel and Wacław Kiełtyka, and drummers Tony Costanza, Chris Kontos and Dave McClain are former members of the band; Mader and Kontos toured with the band in 2019 and 2020 as part of the 25th anniversary tour for its first album, Burn My Eyes (1994).