Death metal
Death metal utilizes the speed and aggression of both thrash and hardcore, fused with lyrics preoccupied with Z-grade slasher movie violence and Satanism. Death metal vocals are typically bleak, involving guttural "death growls", high-pitched screaming, the "death rasp", and other uncommon techniques.&lt;ref name="Genre—Death Metal/Black Metal"&gt;[ "Genre—Death Metal/Black Metal"]. AllMusic. Retrieved on February 27, 2007.&lt;/ref&gt; Complementing the deep, aggressive vocal style are downtuned, heavily distorted guitars and extremely fast percussion, often with rapid double bass drumming and "wall of sound"–style blast beats. Frequent tempo and time signature changes and syncopation are also typical.