In the year Roman tradition gives as 390 BC a Gaulish war party came up the cliff of the Capitol by night, past guard dogs that never barked, and the soldier woken by the sacred geese of Juno, honking so harshly that he ran to the edge and hurled the first climber back down the rock, was Marcus Manlius. The garrison lived because the ugliest noise on the hill went off in time. The geese had been spared through the whole siege, hungry as the defenders were, because they belonged to the goddess.
Why people hate heavy metal comes down, more often than any sermon would like, to the same kind of noise. Built from distortion, screams and a drummer's two feet, the music reaches an unconverted ear as a sound designed to raise an alarm, arriving in a kitchen, a car or a bedroom next door where nobody asked for one, and the ear does what ears have done since long before the Capitol: it takes the alarm seriously. The fan has learned to hear something else in it. Most people never have.
The pulpits, committees and lawsuits that turned the dislike into a campaign are set out in the chapter that covers it. The dislike itself came first, and it sorts into a handful of objections: the noise, the voice, the aggression and the costume, and the class of people assumed to be listening. Each of them is a real hearing of a real sound.
Why people hate heavy metal: the noise
Distortion is a fault by the engineer's own definition, an amplifier pushed past the point where it can reproduce the wave it is given, so that the tops of the wave are sheared flat and a clean note comes out wrapped in harmonics nobody played. The UCLA biologist who asked what that does to a listener, adding noise and abrupt jumps in pitch to emotionally neutral music and playing both versions to volunteers, was Daniel Blumstein.
Writing in Biology Letters in 2012 with Gregory Bryant and Peter Kaye, he reported that the roughened versions were heard as more arousing and more negative, and the explanation in the paper comes from the animal world: a throat or a syrinx overblown in fear produces exactly those harsh, unpredictable sounds, and animals, people among them, are built to take them seriously. A distorted guitar sounds, to an unprepared nervous system, like something frightened and very large. The fan has learned that it is not. The neighbour has not.
The London trio that made the objection its entire programme was Motörhead, and "Overkill", the title track of its March 1979 album on Bronze, opens on Phil Taylor's two bass drums with Lemmy Kilmister's bass pushed through the amplifier until it growls like a rhythm guitar, an onslaught with no quiet corner anywhere in it. There is nothing for a new listener to hold on to except the pulse. That was the point.
Bomber followed on Bronze that October, seven months later, with the dials where they had been left. Lemmy said he wanted Motörhead to be the band that, if it moved in next door, would make the neighbours' lawn die. It was a boast about exactly the thing the neighbours objected to.
The scream at the top of the mix
The voice is the second objection, and the science behind it is younger. The team from Geneva and New York that measured what separates a scream from ordinary speech, publishing in Current Biology in July 2015, was led by Luc Arnal, and the property it found was roughness: a loudness that flickers between thirty and a hundred and fifty times a second, where speech moves at four or five.
The rougher the scream, the more frightening the listeners judged it, and the harder it drove the amygdala, the part of the brain that handles fear. A singer pushing a note to the ragged top of his range sends an untrained listener the message a scream sends, whatever the words happen to say.
The Judas Priest singer whose screams on the title track of Painkiller, released in September 1990, tear over Scott Travis's double bass drums and shear off at the very top of his range was Rob Halford, and to a listener with no history in the music the effect is exactly what the Geneva study measured. The fan hears a man winning. Everyone else hears a man in danger.
Extreme metal went further down the same road, turning the whole vocal line into growl and shriek, and lost the unconverted listener at the first bar.
The costume and the clenched fist
Aggression is the third objection, and it is partly accurate, because the music performs aggression on purpose: the fist in the air, the legs planted wide, the riff delivered like a threat. A listener who takes performance literally takes the threat literally too. The pit completed the misunderstanding: a floor of colliding bodies looks, from the balcony, like a brawl, and the people in it haul each other back to their feet whenever anyone goes down.
The costume did the rest. Long hair on men, make-up on men, leather and studs and denim patched with the names of other bands were an objection before a note was heard, and they were meant to be; a uniform that reassured the parents would have been a failed uniform. The apostasy was the point of the clothes. They announced a taste the way a flag announces a side.
The sleeve carried the costume into places the music never reached. The East London five who put a rotting corpse named Eddie on the front of every album from 1980 onward were Iron Maiden, and the figure reached parents no lyric sheet ever could, because a sleeve in a shop window ambushes people who will never hear a note of what is inside it.
They announced a taste the way a flag announces a side.
Class, critics and the hall of fame
In 1863 the jury of the Paris Salon threw out more than half of the five thousand works sent to it, and Napoleon III, hearing the protests, ordered the refused canvases hung in rooms of their own so the public could judge them. Crowds came to jeer. The painter whose picture drew the loudest laughter, a naked woman at a picnic between two dressed men, was Édouard Manet, and Le Déjeuner sur l'herbe now hangs in the Musée d'Orsay.
Heavy metal spent more than thirty years in rock's own Salon des Refusés. The Rock and Roll Hall of Fame admits a performer twenty five years after the first record, and the Birmingham four eligible from 1995 and admitted only in 2006 were Black Sabbath. Judas Priest waited until 2022. Iron Maiden, eligible since 2005, sat twenty one years in the refused rooms before the class of 2026, and Motörhead still hangs there.
The records had sold for decades and had lasted, with a pedigree no other loud music could match. What counted against them was the company they kept, the audience it was assumed to have, young, male and working class, and a taste can be held against a person far more easily than a class can. The prize juries were not listening to the records. They were looking at the car park.
The last objection is familiarity
The Michigan psychologist who showed in a 1968 monograph that people come to like nonsense words, Chinese characters and photographs of strangers' faces simply by being shown them more often was Robert Zajonc, and the mere exposure effect he described explains the complaint every fan has heard, that it all sounds the same. It sounds the same to anyone who has not heard enough of it. After a hundred records the differences are the whole of the music. Zajonc's volunteers never saw a record sleeve, but the mechanism does not care what is repeated: a riff heard ten times has stopped being noise and become a shape. Few fans can say what changed on the night the noise turned into music, except the number of times they had heard it.
None of these objections is a charge sheet. They are honest reactions to real sounds, a roughness the ear treats as danger, a scream it treats as distress, a costume it reads as a declaration, and a taste it reads as a class. The heavier accusation, that the music made people act, is a different matter, and the killings blamed on heavy metal were answered in court rather than in taste.
Dislike is not evidence. It is a starting position, and a great many fans held it once.
