Editing Chuck Billy (section)

===Testament===
Billy joined Legacy in 1986, replacing vocalist [[Steve Souza|Steve "Zetro" Souza]] who would later join [[Exodus (band)|Exodus]]. After Legacy changed its name to Testament, the band released their debut album ''[[The Legacy (album)|The Legacy]]'' in 1987, which featured one song written by Billy entitled "Do or Die". Testament has since released twelve more studio albums, and toured consistently, including sharing the stage with notable acts such as [[Iron Maiden]], [[Judas Priest]], [[Black Sabbath]], [[Lamb of God (band)|Lamb of God]], [[Devin Townsend]], [[Kiss (band)|Kiss]], [[Megadeth]], [[Slayer]], [[Anthrax (American band)|Anthrax]], [[Exodus (band)|Exodus]], [[Overkill (band)|Overkill]], [[Korn]], [[Sepultura]], [[Suicidal Tendencies]], [[Pantera]], [[White Zombie (band)|White Zombie]], [[Primus (band)|Primus]], [[Dirty Rotten Imbeciles|D.R.I.]] and [[Pro-Pain]].<ref name=":0">{{cite web|title=The Legacy / Testament|url=http://metallipromo.com/leg.html|work=metallipromo.com|accessdate=November 21, 2017}}</ref><ref>{{Cite web|url=http://www.dfwundercover.com/review/testament-sepultura-prong-gas-monky-live/|title=Testament Sepultura Prong - Gas Monky Live - DFW Undercover|website=dfwundercover.com|accessdate=November 21, 2017|archive-url=https://web.archive.org/web/20170628195614/http://www.dfwundercover.com/review/testament-sepultura-prong-gas-monky-live/|archive-date=June 28, 2017|url-status=dead}}</ref><ref>{{cite web|title=Monsters of Rock Schweinfurt 1988 Line-Up|url=http://www.songkick.com/festivals/471099-monsters-of-rock-schweinfurt-1988/id/13337064-monsters-of-rock-schweinfurt-1988-1988|publisher=songkick.com|accessdate=November 21, 2017}}</ref><ref>{{cite web|title=Monsters of Rock 1992 Reggio Emilia Line-Up|url=https://www.songkick.com/festivals/4166-monsters-of-rock/id/2273061-monsters-of-rock-1992|publisher=songkick.com|accessdate=November 21, 2017}}</ref><ref>{{cite web|url=http://www.metallipromo.com/wz.html|title=White Zombie|publisher=metallipromo.com|accessdate=November 21, 2017}}</ref><ref>{{cite web|url=http://www.pro-pain.fr/stuff_flyers.html|title=Stuff_flyers|publisher=pro-pain.fr|accessdate=November 21, 2017}}</ref><ref>{{Cite web |title=Chuck Billy Joins Devin Townsend On Stage |url=http://www.metalunderground.com/news/details.cfm?newsid=57595 |access-date=2022-08-04 |website=Metalunderground.com |language=English}}</ref><ref>{{cite web|title=TESTAMENT ANNOUNCE REMASTERED VERSIONS OF THE LEGACY & THE NEW ORDER|url=https://www.metal-rules.com/2024/06/07/testament-announce-remastered-versions-of-the-legacy-the-new-order/|website=[[Metal Rules|metal-rules.com]]|accessdate=June 16, 2024}}</ref>

Although Testament's lineup has changed over the years, Billy is one of the two constant members of the band along with guitarist and founder [[Eric Peterson (musician)|Eric Peterson]]; they are the only two members of Testament to appear on all of the band's studio albums. His vocal style has changed considerably over the years from a clear, high-pitched thrash style to a lower register approaching a [[death grunt]]. Since the ''[[Low (Testament album)|Low]]'' album, he has mixed both styles, sometimes within the same song.<ref>{{cite web|url={{AllMusic|class=artist|id=p5622/biography|pure_url=yes}}|title=Biography: Testament|last=Rivadavia|first=Eduardo |publisher=[[Allmusic]]|accessdate=March 16, 2010}}</ref>