Chuck Billy
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Charles Billy (born June 23, 1962) is an American vocalist, who is best known as the lead vocalist for the thrash metal band Testament.

Billy joined Legacy in 1986, replacing vocalist Steve "Zetro" Souza who would later join Exodus. After Legacy changed its name to Testament, the band released their debut album The Legacy in 1987, which featured one song written by Billy entitled "Do or Die". Testament has since released ten more studio albums, and toured consistently, including sharing the stage with notable acts such as Iron Maiden, Judas Priest, Black Sabbath, Kiss, Megadeth, Slayer, Anthrax, Exodus, Overkill, Sepultura, Suicidal Tendencies, Pantera, White Zombie, Primus, D.R.I. and Pro-Pain.

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; 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 album, he has mixed both styles, sometimes within the same song.