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Extreme instrumentation, i.e. faster, heavier, more aggressive, more abrasive
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Emphasis on technical control and fast tempos
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Less focus on melody
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High levels of distortion that also include vocals (grunting, screaming)
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Extreme types of vocals (guttural, harsh or abrasive singing)
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The instrumental part may be more melodic than the vocal line
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Music may be Lo-Fi (sometimes on purpose)
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Darker lyrics (death, war)
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Visual transgression (weaponry, bloody or horrific artwork)
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Focusing more on rhythm guitar