Steve "Zetro" Souza (born March 24, 1964) is an American musician, best known for his work as a former lead vocalist with thrash metal band Exodus from 1986 to 1994, and again from 2002 to 2004.

[4][5] Souza hosted the Thrash Against Cancer benefit in 2005 at The Pound in San Francisco, and appears onstage with Testament every time they play the Bay Area.

In 2007, they went on a world tour and did Fields of Rock in the Netherlands alongside Heaven & Hell, Korn, Iron Maiden, Ozzy Osbourne, Machine Head, Black Label Society, Hatebreed, Megadeth, Papa Roach, Slayer, Motörhead, Mastodon, Velvet Revolver, Dream Theater, Suicidal Tendencies, Amon Amarth, DragonForce, Ill Niño, and DevilDriver.

In August 2008, Souza became the lead singer for the metal band TENET along with members Byron Stroud (Strapping Young Lad, Fear Factory, Zimmer's Hole), Jed Simon (Strapping Young Lad, Zimmer's Hole), Glen Alvelais (Testament, Forbidden) and Gene Hoglan (Death, Unearth, Dethklok, Strapping Young Lad, Dark Angel, Testament, Zimmer's Hole, Old Man's Child).

Steve eventually left Hatriot due to Exodus touring duties in 2015 and was succeeded by his son Cody.

Souza's voice is reminiscent of AC/DC's former vocalist Bon Scott, and can be heard on the AC/DC covers that Exodus recorded, including "Overdose" on 1989's Fabulous Disaster, and "Dirty Deeds Done Dirt Cheap" on 2004's Tempo of the Damned.

[11] In a July 2018 interview, Souza called himself a supporter of President Donald Trump, as he cites the low unemployment rate and the meetings with North Korean leader Kim Jong-un being beneficial to the country.