Denver's Khemmis blend crushing doom with soaring melodic leads and harmonized vocals, carving out a sound that feels both ancient and emotionally immediate. Since forming in 2015, they've become one of the most celebrated doom acts in the American underground.

Houston's Khepera weave progressive ambition through death and thrash metal, drawing on the technical flair of their city's storied extreme metal scene. Their sound rewards patience — dense arrangements that reveal new details on repeated listens.

Khrophus is a death metal band from São José, Santa Catarina, Brazil, with roots stretching back to 1993. The current lineup features Leonardo Chagas (vocals, bass), Adriano Ribeiro (guitar), and Carlos Fernandes (drums), and the band has built a steady discography including Presages (2009) and Eyes of Madness (2013), the latter a ten-track album showcasing their straightforward, groove-driven approach to old-school death metal.

Cape Coral, Florida's Kick Em Ugly fuse death metal ferocity with the swaggering grit of Southern metal, arriving at something mean-spirited and distinctly American. Their music carries a backwoods heaviness that doesn't apologize for itself.

Kiko Loureiro is a São Paulo-born guitarist best known as a founding member of Angra and as Megadeth's lead guitarist from 2015 to 2023, who has maintained a prolific solo career since his instrumental debut No Gravity (2004). His solo output spans melodic progressive metal and jazz-inflected shred across albums including Universo Inverso, Fullblast, and Sounds of Innocence (2012). His fifth solo album, Theory of Mind (October 2024), explores themes of empathy and human connection through ten tracks of melodic progressive metal.

Kiko Shred is a heavy and power metal guitarist and bandleader from Americana, São Paulo state, Brazil, whose neoclassical 1980s-influenced style has drawn comparisons to the golden era of guitar-driven metal. Active since the mid-2010s, the project has released four studio albums including Riding the Storm (2018), Royal Art (2019), and Rebellion (2021), the last of which was picked up for worldwide distribution by Germany's Pure Steel Records. Kiko Shred has shared stages and sessions with singers including Tim "Ripper" Owens, Michael Vescera, and Leather Leone.

Fullerton, California's Kilimanjaro plant their flag firmly in traditional heavy metal, delivering riff-forward songs steeped in the genre's classic vocabulary. Active since 2010, they favor hooks and power over gimmick.

Formed in 2020 in Alma, Michigan, Kiljin play heavy metal with a small-town directness — no frills, no pretense, just guitars built to move a room. Their approach owes more to the blue-collar Midwest than to any coastal trend.

Phoenix's Kilk operate at the intersection of melodic death metal and straight-ahead brutality, shaping riff-driven songs with enough melodic hooks to stick. Since 2018, they've been one of the more consistent presences in Arizona's heavy underground.