Rising out of Brazil during the heyday of thrash, Sepultura unleashed a raw, beastial sound that tore open ears with vicious canine riffs at a desperate velocity. As they progressed as a band, they brought a more urgent political edge to their death-dwelling imagery and lyrics while their sound became tighter, more produced and, if such a thing were possible, heavier. Their low-end swelled open like a gate to the abyss. They also began to incorporate "tribal" images and rhythms, adding hand percussion and drawn-out, hypnotic low-end rhythms. Throughout their career, Sepultura have managed to be among the most aggressive and brutal bands of their era.