Heavy metal fans are often stereotyped as being lazy, vulgar, and ignorant.
Long-term listening to loud music can cause hearing loss. Hair cells in the ear move in reaction to fluid motion brought on by vibrations from sound waves. When these hairs contact tiny hair-like projections in the ear, channels open and a path for electrical signals to get to the brain is made possible. Led Zeppelin, Black Sabbath, and Deep Purple—often referred to as the "unholy trinity"—are regarded as the pioneers of heavy metal. Black Sabbath and Deep Purple both released significant albums in 1970, while Led Zeppelin released their self-titled debut in 1969.
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