Question: What do both Michael Tait and Alissa White-Gluz d0?

Context paragraphs:
Haven (Kamelot album): Haven is the eleventh studio album by the American power metal band Kamelot.  The album is produced by Sascha Paeth and mastered by Jacob Hansen.  The cover and artwork were created by Stefan Heilemann and the additional art/layout were done by Gustavo Sazes.  It features guest appearances by Alissa White-Gluz (Arch Enemy), Troy Donockley (Nightwish) and Charlotte Wessels (Delain).

Vicky Psarakis: Vicky Psarakis is a Greek American vocalist, best known as the vocalist of Canadian metal band, the Agonist.  She joined in 2014 after original vocalist and co-founder Alissa White-Gluz was asked to leave the band after joining Arch Enemy.  She has released one EP titled "Disconnect Me" and two albums titled "Eye of Providence" and "Five" with the Agonist.

Arch Enemy discography: The following is a comprehensive discography of Arch Enemy, a Swedish melodic death metal band that formed in 1996.  Its members were in bands such as Carcass, Armageddon, Carnage, Mercyful Fate, Spiritual Beggars, and Eucharist.  It was founded by Carcass guitarist Michael Amott along with Johan Liiva, who were both originally from the influential death metal band Carnage.  The band has released ten studio albums, three live albums, three video albums and three EPs.  The band was originally fronted by Johan Liiva, who was replaced by German Angela Gossow as lead vocalist in 2000.  Gossow left the band in March 2014 and was replaced by Canadian Alissa White-Gluz, while remaining as the group's manager.

Arch Enemy: Arch Enemy is a Swedish melodic death metal band, originally a supergroup, from Halmstad, formed in 1996.  Its members were in bands such as Carcass, Armageddon, Carnage, Mercyful Fate, Spiritual Beggars, Nevermore, and Eucharist.  It was founded by Carcass guitarist Michael Amott along with Johan Liiva, who were both originally from the influential death metal band Carnage.  The band has released ten studio albums, three live albums, three video albums and four EPs.  The band was originally fronted by Johan Liiva, who was replaced by German Angela Gossow as lead vocalist in 2000.  Gossow left the band in March 2014 and was replaced by Canadian Alissa White-Gluz, while remaining as the group's manager.

War Eternal: War Eternal is the ninth studio album by Swedish melodic death metal band Arch Enemy, which was released on June 9, 2014 by Century Media.  It is the first Arch Enemy album in 13 years since Wages of Sin to feature a new line-up; Alissa White-Gluz took over on vocals after former long-time vocalist Angela Gossow stepped down from vocal duties to be the band's business manager.  Additionally, ex-Arsis guitarist Nick Cordle replaced Christopher Amott in 2012.  Cordle ultimately left the band just before their European tour and was replaced by former Nevermore Guitarist Jeff Loomis

The Agonist: The Agonist is a Canadian metal band from Montreal, Quebec, formed in 2004.  The current line up consists of guitarists Danny Marino and Pascal (Paco) Jobin, bassist Chris Kells, drummer Simon Mckay, and vocalist Vicky Psarakis, who joined in March 2014 following the departure of vocalist and founding member Alissa White-Gluz.  Both Psarakis and White-Gluz use growled and clean vocals.  Originally known as the Tempest, the band adopted their current moniker upon their signing to Century Media in 2007.  To date, the Agonist has released five studio albums; the latest, "Five", was released in September 2016.  Touring extensively since their first album, they have shared the stage with bands such as Arsonists Get All the Girls, Epica, the Faceless, Chelsea Grin, Kamelot and Visions of Atlantis.

Eye of Providence (album): Eye of Providence is the fourth studio album by Canadian metal band The Agonist.  It was released on February 23, 2015 in Europe and the following day in North America.  It is the first full-length album featuring vocalist Vicky Psarakis since the departure of founding member and original vocalist Alissa White-Gluz in 2014.  The album received general acclaim from critics, with many applauding the utilization of Psarakis' vocals and her distinction from White-Gluz.

Michael Tait: Michael DeWayne Tait (born May 18, 1966) is a contemporary Christian music artist.  Michael Tait met Toby McKeehan in 1984 when he was in high school.  Both Toby and Michael met Kevin Max while attending Liberty University in the late 1980s, and together they formed four-time Grammy winning band DC Talk, with whom Michael Tait has released five acclaimed studio albums.  Tait is the current lead singer of Newsboys, and one third of Christian rock group DC Talk (though the group has been on hiatus since 2000).  Tait also has had success in his solo career, founding a band called Tait in 1997.  He toured as a solo act until 2007.  He became lead singer of the Christian pop rock band Newsboys in 2009, and though Peter Furler was the lead vocalist on the album "In the Hands of God", Tait provided supporting vocals on the project.  Aside from singing, Tait is also a self-taught guitar player.  Tait also has a sister Lynda Randle, who is a Southern Gospel singer.

Prisoners (album): Prisoners is the third studio album by Canadian metal band The Agonist.  It was released on June 4 in Europe and June 5, 2012 in North America via Century Media records and was produced by the band's longtime producer Christian Donaldson.  "Ideomotor" has been confirmed as the first single.  The album sold 1,400 copies in the United States in the first week of its release and debuted at No. 19 on the Top New Artist Albums (Heatseekers) chart.  This is the last album with original singer Alissa White-Gluz before she joined Arch Enemy in 2014.

Alissa White-Gluz: Alissa White-Gluz ( ; born July 31, 1985) is a Canadian vocalist, best known as lead vocalist of the Swedish melodic death metal band Arch Enemy, and former lead vocalist and founding member of the Canadian metal band The Agonist.

Supporting paragraphs: Michael Tait Alissa White-Gluz
Answer: lead vocalist