συμφωνα με wikipedia: Sludge metal is a form of heavy metal music that is generally regarded as a fusion of doom metal and hardcore punk often incorporating stoner metal[1] and southern rock influences.
Sludge metal combines the slow-tempos, heavy rhythms and dark atmosphere of doom metal with the shouted vocal delivery and fast-tempos of hardcore punk. The string instruments (electric guitar and bass guitar) are heavily distorted and often use a high level of audio feedback to produce a sludgy sound. Guitar solos are often absent. Drumming bears similarities to the style of drumming present in hardcore punk, although the beats may be slowed considerably. The tempo usually falls somewhere between 50 and 80 beats per minute (bpm).
Vocals are usually shouted as in hardcore, and lyrics are generally blue-collar in nature; reflecting on society, generally in a depressive, cynical or downtrodden manner.
Many sludge metal bands from the Southern United States incorporate southern rock influences and imagery, although it should be noted that not all sludge metal bands share this style. Due to the similarities with stoner metal, there is often a crossover between the two genres, but sludge metal generally avoids stoner metal’s positive atmosphere and its usage of psychedelia. Sludge metal also bears some musical and lyrical resemblance to crust punk (for example Dystopia).
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