Chuck Billy

In March 2020, Billy and his wife Tiffany were tested positive for COVID-19 following the completion of The Bay Strikes Back tour in Europe; he was the third person to have returned home sick from the aforementioned tour, following Will Carroll of Death Angel and Gary Holt of Exodus. Testament confirmed the testings in a statement and had been quarantined in his home since then.

Billy and Jake Oni contributed vocals to the song "The Never" from Lamb of God guitarist Mark Morton's debut solo album Anesthetic, released in March 2019.

In 2019, Billy appeared as a featured artist on the Killswitch Engage song "The Crownless King" from their album Atonement.

In 2015, Billy appeared on Metal Allegiance's self-titled album and provided featured vocals on the track "Can't Kill The Devil."

In 2014, Billy provided guest vocals on the song "Trend Killer" on Swedish melodeath band The Haunted's album Exit Wounds.

In 2013, California State Assemblyman Jim Frazier honored Billy on the State Assembly floor for his positive influence on the Native American community.

Billy became the first Native American to be permanently featured in the memorabilia display at the Hard Rock Hotel in Albuquerque, New Mexico in 2013. He is also recognized in the National Museum of the American Indian exhibit in the Smithsonian Institution titled, "Up Where We Belong: Native Musicians in Popular Culture" which was on display through January 2, 2011.

For the live presentation of the album Ziltoid the Omniscient by Devin Townsend, he provided the voice of the Planet Smasher on the track of the same name. This happened at Tuska Open Air Metal Festival 2010 in Helsinki.

In 2009, Billy appeared on the song "Live My Dream" from the band Susperia's album, Attitude.

In 2008, Billy did the vocals for Silent Night on the album of Christmas carols We Wish You a Metal Xmas and a Headbanging New Year with the likes of Scott Ian, Jon Donais, Chris Wyse and John Tempesta.

In 2006, Billy provided vocals on the Sadus song "Crazy" and, along with several other musicians from other bands, did a cover of Iron Maiden's "Fear of the Dark" for their Numbers from the Beast tribute album. On Light This City's 2008 release, Stormchaser, he provides vocals on the song "Firehaven."

In 2014, Billy appeared on fellow thrash metal band Exodus' latest album Blood In, Blood Out and provided guest vocals on the track "BTK." He had previously filled in Zetro on vocals for Exodus' performance on October 28, 2004 at the Warfield Theatre in San Francisco, where the band opened for Megadeth.

In 2001, Billy was diagnosed with germ cell seminoma; his was a rare medical situation since this type of cancer usually manifests in men's testicular region, while in Billy's case the tumor appeared in the chest region near his heart. In August 2001, friends organized the Thrash of the Titans benefit concert, held to raise money for Billy's medical expenses. Following chemotherapy, he has since been given a clean bill of health and continued his work with Testament.

Around 1996, Billy auditioned for lead vocals with Sepultura as the replacement for Max Cavalera, but lost that position to Derrick Green.

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.

Prior to Legacy and Testament, Billy was the vocalist for a local metal band called Guilt which also featured future Hericane Alice and Medicine Wheel guitarist Danny Gill. No records by the band exist but they recorded one demo in 1984 and contributed the song "Down to the City" to the U.S. Metal Vol. IV compilation on Shrapnel Records. He also played in high school bands.

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