This page will explain what kind of music is Technical Death Metal, which is subgenre of well known Death Metal.

Technical death metal refers to death metal that focuses on complex rhythms, riffs and song structures. As death metal bands evolved, some experimented with elements from a variety of genres. As a result of such experimentation, exemplified by Cynic, Atheist and Pestilence, the subgenre of technical death metal established itself as a complex and varied musical style.

Technical death metal incorporates influences from jazz fusion and progressive rock into death metal aesthetics, producing music that is unexpected and relatively difficult to play. Songs tend to be written without distinct verse-chorus form, with varied or layered time signatures, and sometimes dissonant guitar riffs.

More technical experimentations in death metal began in the late 1980s and early 1990s by bands such as Death, Morbid Angel, Monstrosity, and Atheist. In 1989 Atheist’s debut album Piece of Time was released, followed by Nocturnus’s The Key, in 1990. In 1991, Death released Human. This album and later Death albums have proven influential on 1990s technical death metal bands. Other early technical death metal albums are Considered Dead (1991) by Gorguts, Nespithe (1993) by Demilich and Focus (1993) by Cynic.

Bands currently heralded as technical death metal icons include Nile, Meshuggah, Necrophagist, Decapitated, Spawn of Possession, The Faceless, Psycroptic, and Anata.

Source: Wikipedia.org