Portal:Heavy metal/Selected article

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Heavy metal is a form of rock music characterised by aggressive, driving rhythms, highly amplified guitars, and often dark thematic elements. Heavy metal is an evolutionary product of pop, blues and classical music. Its first wave, between 1967 and 1974, was a product of pop and blues, while the classical element came to the fore in the later 1970s. By approximately 1991 most heavy metal had evolved into other hard rock genres, notably grunge.