The only metal choir in the world graces the AGT stage with this surprising performance! Dremeka Choir performs "O Fortuna" and finishes with "Toxic" by Britney Spears. 'America's Got Talent' has served up another metal experience. Watch the Growlers Choir, Also known as the Dremeka Choir. These death metal-themed musicians, surprised judges and the audience as they auditioned on the competition show by bellowing "O Fortuna", then launching into a metal rendition of Britney Spears' 2003, "Toxic".