Brutal prog is a niche, high-intensity subgenre of progressive rock that merges extreme, chaotic musicality—such as math rock, grindcore, and free jazz—with complex, avant-garde structures. It emphasizes jarring dissonance, rapid tempos, and heavy, aggressive sonic elements, often utilizing angular, "whiplash-inducing" rhythms and DIY punk aesthetics to create a visceral, non-melodic listening experience.