Alternative metal
One of the main characteristics of alternative metal and its subgenres are heavily downtuned, mid-paced "chug"-like guitar riffs. However, funk metal bands often use a more conventional riffing style influenced by 1980s thrash metal. Alternative metal features clean and melodic vocals, influenced by those of alternative rock, in contrast to other heavy metal subgenres. Later bands frequently incorporated vocal styles that alternated between clean singing, growls and screaming. Examples include alternative metal bands associated with the nu metal movement, such as Korn and Deftones, who have been described as having "bipolar vocals".