Massacration is a Brazilian satirical heavy metal band, self-proclaimed "greatest and most classic heavy metal band, the inspiration behind most heavy bands since 1985, whose members' hairdos and posing influenced the whole heavy metal culture".
 The classical line-up consists of Detonator (vocal, Bruno Sutter), Blondie Hammet (lead guitar, Fausto Fanti), Metal Avenger (bass guitar, Marco Antônio Alves), Jimmy "The Hammer" (drums, Felipe Torres) and Headmaster (rhythm guitar, Adriano Pereira).
Patrick Bruders is an American musician, best known as the current bassist for heavy metal supergroup Down, the former bassist of the blackened death metal band Goatwhore from 1997 to 2004, and the former bassist for the seminal sludge metal band Crowbar from 2005 until 2013.
 In 2008 he joined Eyehategod side project Outlaw Order and began live bass duties for the band, but has since parted ways with the group.
 He began touring as live bassist with heavy metal supergroup Down in early 2011, replacing former bassist Rex Brown, before being added as a permanent member, performing bass duties live and in the studio.
 Bruders is also a member of the New Orleans-based crust punk band Gasmiasma, Austin-based country band Pure Luck, and joined legendary doom metal band Saint Vitus for their performance at the Hammer of Doom music festival in Würzburg, Germany.
Obús is a Spanish heavy metal band created in Madrid in the early 80s.
 They stood out because they took the risk of making a big spectacle in their concerts in order to reach to the level of other international heavy metal bands.
 In addition, the lyrics they write and the feelings they transmit connect with the people that follow them.
 As they said in an interview: "All our songs , some more and some less, have a meaning".
 Far away from renouncing to their genre, they have always claimed that they were a heavy metal band and they even wrote a song about this genre in their first LP called"Dosis de Heavy Metal".
In 2012, because of their 30th anniversary, they did a Tour around Spain.
Darkest Hour is an American heavy metal band from Washington, D.C., formed in 1995.
 Though failing to break early in their career, the band has received acclaim for their albums "Undoing Ruin", "Deliver Us", and "The Eternal Return".
 "Deliver Us" debuted at number 110 on the Billboard album charts, with sales of 6,600, and their more recent effort "The Eternal Return" garnered them an even higher position in the Billboard album charts at number 104.
 Their latest self-titled effort charted at 102 on the Billboard 200, a peak for the band, and it marked a stylistic shift in the band's discography.
Heavy metal bass is the use of the bass guitar (also called "electric bass") in the rock music genres of heavy metal and hard rock.
 The bassist is part of the rhythm section in a heavy metal band, along with the drummer, rhythm guitarist and, in some bands, a keyboard player.
 The prominent role of the bass is key to the metal sound, and the interplay of bass and distorted electric guitar is a central element of metal.
 The bass guitar provides the low-end sound crucial to making the music "heavy".
 The bass plays a "...more important role in heavy metal than in any other genre of rock."
The History of Heavy Metal ("Hårdrockens historia") is a Swedish 2001 documentary movie made for TV spanning through the timeline of heavy metal music.
 It starts with the roots of heavy metal and ends with the metal of present times.
 Through interviews and archive material, the movie tries to give answers on many questions, including "which was the first heavy metal band?"
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 It was produced by Malik Bendjelloul and edited by Mikael Björnsson and Johan Larsson for Barracuda Film & TV.
Roberto Agustin Trujillo (] ; born October 23, 1964) is an American musician and songwriter best known as the current bassist of the heavy metal band Metallica, a position he has held since 2003.
 He was also a member of crossover thrash metal band Suicidal Tendencies, funk metal supergroup Infectious Grooves, and heavy metal band Black Label Society, and has worked with Jerry Cantrell and Ozzy Osbourne.
Frodus (a.k.a. Frodus Conglomerate International, Frodus Sound Laboratories, FCI, Frodus Escape Plan, Frodus Deposit Insurance Corporation) was an American post-hardcore band formed in 1993 in Washington, D.C. by vocalist/guitarist Shelby Cinca and drummer Jason Hamacher.
 The band went through numerous bassists over the course of their career.
 They are described by critics as one of the most influential post-hardcore bands of the 1990s.
 Their mixture of math rock and hardcore punk plus their lyrical themes, frequently dark and dissonant and seen as esoteric for the time, proved to be influential to bands such as Thrice and Rosetta.
Jason Hamacher is an American musician.
 He was the drummer for the bands Frodus, Decahedron, Combatwoundedveteran, and the straight-edge band Battery.
 He also sang under the pseudonym "Ponan" for the Washington, DC punk band Mancake (Part Man... Part Pancake...), which released an EP on Art Monk Construction in 1999 entitled "We will destroy you".
 Hamacher is in a band called Zealot with Mike Schliebaum of Darkest Hour.
 He played for the band Good Clean Fun on a tour going through Europe.
Regents is a punk rock band formed in 2007 by former Sleepytime Trio and Maximillian Colby guitar/vocalists Drew Ringo & David NeSmith and drummer Jason Hamacher of Frodus.
 Originally a keytar & drum duo called "Regions", the pair recruited NeSmith's Sleepytime Trio and Maximillian Colby bandmate Drew Ringo, as well as former The Exploder bassist Dan Evans and begun playing under the name Regents.

Question: Jason Hamacher is in Zealot with a member from which heavy metal band?
Answer: Darkest Hour