Roots of Once Human

Xandria is a German symphonic metal band founded by Marco Heubaum in 1994. Originally a project, Heubaum later restarted the project as a band in 1999, and has gone through various lineup changes. The German vocalist Lisa Middelhauve joined for the debut album, co-writing both music and lyrics for the band until her departure in 2008. Middelhauve reunited briefly with the band in 2010 following the departure of the band's second vocalist Kerstin Bischof, but left again shortly after. Manuela Kraller joined the band as the new vocalist in 2010.

Arch Enemy is a Swedish melodic death metal band, originally a supergroup from Halmstad, formed in 1995. Its members have been in bands such as Carcass, Armageddon, Carnage, Mercyful Fate, Spiritual Beggars, The Agonist, Nevermore, Eucharist, and Once Human. It was founded by Carcass guitarist Michael Amott along with Johan Liiva, who were both originally from the death metal band Carnage. The band has released eleven studio albums, three live albums, three video albums and four EPs. The band was originally fronted by Johan Liiva, who was replaced by German vocalist Angela Gossow in 2000. Gossow left the band in March 2014, subsequently becoming the group's manager, and was replaced by Canadian vocalist Alissa White-Gluz. White-Gluz left the band at the end of 2025. American vocalist Lauren Hart was announced as the band's new frontwoman on 19 February 2026.

DevilDriver is an American heavy metal band from Santa Barbara, California, formed in 2002, consisting of vocalist Dez Fafara, bassist Jon Miller, lead guitarist Alex Lee, drummer Davier Pérez Ortega and rhythm guitarist Gabe Mangold. The band was originally named Deathride; however, due to copyright issues and the name being taken by several bands, the band changed its name to DevilDriver.