Editing Chuck Billy (section)

===Work outside of Testament===

Billy's influences reportedly include [[John Lennon]], [[Paul Stanley]], [[Rob Halford]], [[Ronnie James Dio]], [[Bruce Dickinson]], [[Phil Mogg]], [[James Hetfield]], [[Ozzy Osbourne]], [[Geddy Lee]], [[Bon Scott]], [[Steven Tyler]], [[Alice Cooper]], [[Robert Plant]], [[Phil Lynott]] and [[Klaus Meine]].

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.

Around 1996, Billy auditioned for lead vocals with [[Sepultura]] as the replacement for [[Max Cavalera]], but lost that position to [[Derrick Green]].<ref>{{cite web|url=http://www.blabbermouth.net/news/andreas-kisser-says-chuck-billys-sepultura-audition-tape-was-interesting/|title=ANDREAS KISSER Says CHUCK BILLY's SEPULTURA Audition Tape Was 'Interesting'|date=December 15, 2013|publisher=[[Blabbermouth.net]]|accessdate=March 2, 2016}}</ref><ref>{{cite web|url=http://www.blabbermouth.net/news/andreas-kisser-recalls-chuck-billys-sepultura-audition-he-did-a-great-job-audio/|title=ANDREAS KISSER Recalls CHUCK BILLY's SEPULTURA Audition: 'He Did A Great Job' (Audio)|date=August 3, 2015|publisher=[[Blabbermouth.net]]|accessdate=March 2, 2016}}</ref>

Billy has also appeared on the solo projects of [[James Murphy (metal guitarist)|James Murphy]], playing on both albums as a guest musician.

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 (song)|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."

He also joined with musicians including his brothers Eddie and Andy Billy, Steve Souza, Greg Bustamante, Steve Robello, Dan Cunningham, Willy Lange to form the band [[Dublin Death Patrol]].

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]].
[[file:Testament 15.jpg|Billy in 2008|thumb|upright]]
In 2009, Billy appeared on the song "Live My Dream" from the band [[Susperia]]'s album, ''[[Attitude (Susperia album)|Attitude]]''.

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 2014, Billy provided guest vocals on the song "Trend Killer" on Swedish [[melodic death metal|melodeath]] band [[The Haunted (Swedish band)|The Haunted]]'s album Exit Wounds.

In 2014, Billy appeared on fellow thrash metal band Exodus’s ''[[Blood In, Blood Out (Exodus 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 2015, Billy appeared on [[Metal Allegiance]]'s self-titled album and provided featured vocals on the track "Can't Kill the Devil."<ref>{{Cite magazine|url=https://www.billboard.com/articles/columns/rock/6598221/metal-allegiance-album|title=Metal Allegiance to Release First Album of Original Material|magazine=Billboard}}</ref>

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

In 2019, Billy appeared as the singer on the song, "Waiting to Die" from the album Imperium by the band Walls of Blood. 

In 2019, Billy appeared as a featured artist on the [[Killswitch Engage]] song "The Crownless King" from their album ''[[Atonement (Killswitch Engage album)|Atonement]]''.

In 2020, Billy appeared on the [[Lamb of God (band)|Lamb of God]] song "Routes" from their [[Lamb of God (album)|self-titled album]].

In 2021, Billy provided additional voices for the Disney+ television series "[[What If...? (TV series)|What If...?]]", part of the Marvel Cinematic Universe.<ref>{{Cite web|title=Testament singer "had a blast" voicing Marvel What If…? episode|url=https://www.thedigitalfix.com/marvel-cinematic-universe/what-if-testament-singer|access-date=2021-10-07|website=The Digital Fix|date=October 6, 2021 |language=en-GB}}</ref>

In 2022, Billy appeared on the [[Matt Heafy]] song "Behold Our Power".<ref>{{cite web|url=https://blabbermouth.net/news/triviums-matt-heafy-and-testaments-chuck-billy-collaborate-on-new-song-behold-our-power/|title=Trivium's Matt Heafy And Testament's Chuck Billy Collaborate On New Song 'Behold Our Power'|website=Blabbermouth.net|date=January 7, 2022|access-date=January 8, 2022}}</ref>

In 2022, Billy appeared on [[deathcore]] band [[Shadow of Intent]]'s song "Blood in the Sands of Time" from their ''[[Elegy (Shadow of Intent album)|Elegy]]'' album which was released on January 14.<ref>{{cite web|url=https://metalnoise.net/2021/11/documentary-the-making-of-elegy-1-from-shadow-of-intent|title=Documentary: "The Making Of Elegy #1" from Shadow Of Intent|website=metalnoise.net|date=November 29, 2021|access-date=January 8, 2022}}</ref>

====Possible solo album====
In an August 2021 interview on The Jasta Show, Billy revealed that he might release a solo album in the future and hinted that its musical direction would be different from the traditional thrash metal style of Testament.<ref>{{cite web|url=http://metalstorm.net/events/news_comments.php?news_id=43192|title=Testament - Chuck Billy Working On Solo Album|publisher=[[Metal Storm (webzine)|Metal Storm]]|access-date=September 3, 2021|date=September 3, 2021}}</ref>