The Canadian music group, comprising 13 metal vocalists, delivered an unusual performance that combined both metal music with choir-based tones.
They began by growling their way through the opera classic “O Fortuna”, alarming the judges, before switching gears mid-performance to cover a metal version of Britney Spears’ 2004 hit “Toxic”.
https://www.billboard.com/video/metal-choir-drags-britney-spears-toxic-to-hell-on-americas-got-talent-billboard-news/