Throughout the history of metal, genres seem to have branched out and recreated themselves. A definition to the distorted outburst of fast-paced guitar chord progressions and barbaric growls, cannot simply be defined as "metal". The genre has become so diverse, that it has been divided into an assortment of categories, and therefore leaving the word "metal" without the prerequisite genre-defining label might lead to confusion. One popular sub genre of metal, is death metal, which in turn, has its respective subdivisions.
The initial classification of death metal was thought of as an assemblage of harsh, macabre, mind thumping melodies and complex percussions. Added with the ferociousness of the "death grunts" and screams, death metal was often regarded as one of the most violent music genres to emerge from metal. Death metal's lyrics often revolved around acts of gory and bloody carnage, destruction and mutilation. As some have regarded this as unorthodox or psychologically sickening, death metal artists defend their work and cherish it as an overkill of entertainment; similar to the aesthetic properties of horror movies.
Today, Grindcore is also known by its own sub-genres including goregrind, deathgrind and noisegrind, while some refer to it as simply "grind". Originating from an "underground" scene, grindcore is intentionally broken off from the mainstream, and is kept alive by small groups of die-hard metal fans all around the globe.
The popularity of Death Metal reached its peak in the mid 1990s and thus encouraged a vast diversity of bands to create an ever-growing sea of new sub-genres.
Death metal provides these people with a glimpse of chaos and nihilism, providing a way to vent as an escape from social norms. Death metal has not collapsed on its own inertia, or becomemorality-driven and conformist like emo or commercial metal bands. Its underground community remains strong and boldly independent.