Phoenix's Halls of Mandos take their name from Tolkien's realm of the dead and build their sound accordingly — doom-laden, post-metal architecture with industrial undercurrents that give the music a cold, machine-like dread. An intriguing young project born in 2023.

Connecticut's Hammerfist blend industrial machinery into their thrash metal framework, giving the Naugatuck Valley act a mechanized, cold-edged aggression that sets them apart from straight-up retro thrashers. Active since 2010.

New York's Hanzel und Gretyl have built a career out of fusing industrial machinery with heavy metal groove, a gleefully deranged act whose electronic aggression and gothic theatrics set them apart from the pack since 2009.

Chicago's Hatemonger arrived in 2021 with a death metal sound rooted in brutality and forward momentum, adding another sharp-edged entry to the city's already fearsome extreme metal lineage.

New York's Hatred Palisade build industrial black metal architecture from cold machinery and corrosive atmosphere, the electronics never softening the aggression but instead amplifying its mechanical dread.

Richmond's Hectic Polarity navigate the disorienting space between industrial metal's mechanical pulse and sludge metal's tar-thick riffing, producing music that's both mechanically precise and organically crushing. Formed in 2020, they represent a relatively uncommon pairing in the American underground.