Backmasking: The Devil in the B-Side

On a spring evening in 1982, in a hearing room at the California State Assembly, a consumer-protection subcommittee sat and listened to a rock record being played backwards. The song was “Stairway to Heaven”. Wound in reverse, a passage of Robert Plant’s vocal was said to contain the words here’s to my sweet Satan and a promise that Satan would give the listener a “little toolshed where he made us suffer, sad Satan”. A neuroscientist testified that the human brain recorded these reversed messages below the level of conscious hearing and stored them, ready to work their corruption. Lawmakers considered whether records should carry a warning label. Across the country, in church car parks, teenagers watched their own albums melt on bonfires. For a few years in the 1980s, a great many sober adults believed that the most popular music in the world had been deliberately engineered to smuggle the Devil into their children’s minds while they slept.

The technique was real first

Before any of the panic, there was a genuine studio craft, and it is worth being precise about it, because the panic borrowed its credibility from a true thing.

Backmasking, in the plain sense of deliberately recording a sound or a phrase and printing it into a track in reverse, is real, and pop musicians pioneered it in the mid-1960s the moment tape machines made it easy. The Beatles were the door. In 1966, working on “Rain”, John Lennon took a reel home, threaded it the wrong way by accident, and heard his own voice run backwards. He loved it. The released single ends with a snatch of the vocal reversed, one of the first intentional backmasks on a hit record. That same year “Tomorrow Never Knows” and, soon after, the tape collage “Revolution 9” turned reversal into a deliberate part of the palette. The Beatles were not hiding anything. They put the effect in plain hearing because it sounded strange and new and they were chasing strange and new.

Others followed, and some did begin to hide little jokes and messages, knowing that a curious listener with a turntable and a steady thumb could spin the record backwards and find them. The Electric Light Orchestra, tired of being accused of Satanic backmasking, buried a mocking reversed message on their 1983 album Secret Messages. Pink Floyd tucked a reversed voice into “Empty Spaces” on The Wall that, played forward-of-backward, congratulates the listener for finding it and gives a phone number. Frank Zappa and others played the same game. So the raw claim at the heart of the scare, that bands sometimes put words on records that only reveal themselves in reverse, was not a fantasy. It was a documented technique with a decade of history behind it.

That is the kernel, and it matters, because it is the reason the panic could not simply be laughed off. When a preacher held up a Led Zeppelin record and said there are hidden reversed words on this, he was describing something that genuinely existed elsewhere in the record bins. The lie did not grow in a vacuum. It grew around a true seed.

The fork: from “some bands do this” to “the Devil is doing it to you”

Watch the exact place the record and the myth diverge, because the fork has two distinct steps, and both of them slip past you if you are not looking.

The first step is from deliberate to found. A backmask that a band actually recorded is a message put there on purpose, sitting in the forward-running audio as a discrete reversed clip. The Satanic claims were something else entirely. They took ordinary vocals, sung and recorded to be heard forwards, and played the whole thing in reverse, then listened for English words in the resulting slur of phonemes. “Stairway to Heaven” contains no backmask. Robert Plant sang lyrics forwards, in English, about a lady and a stairway. What the campaigners did was reverse those forward-sung lines and hunt through the garble for something that resembled speech. That is a fundamentally different act from finding a clip a band chose to hide.

The second step is from coincidental resemblance to intent, and then to mechanism. Having heard here’s to my sweet Satan in the reversed slur, the campaigners concluded, first, that Led Zeppelin had put it there on purpose, and second, that it worked on the listener subliminally, reaching the unconscious mind even when the record was played the normal way round. This is where a folk scare became a claimed science. In the 1982 California hearing, a man named William Yaroll, who described himself as a neuroscientist, testified that the brain decodes and files backward messages automatically, so that a teenager playing an album forwards was being programmed by a Satanic sentence they could never consciously hear. There is no such faculty. The brain has no reverse-speech decoder running in the background, and no experiment has ever shown that phonetically reversed audio, played forwards, transmits any meaning at all. The claimed mechanism was invented to explain a resemblance that the campaigners had themselves produced by spinning the record the wrong way.

Why the ear obeys once it is told what to hear

The uncanny thing about backmasking demonstrations, the thing that convinced those bonfire crowds, is that the words really do seem to leap out once you know them. Play a reversed vocal cold and most people hear only mush. Show them the phrase on a screen, then play it again, and suddenly here’s to my sweet Satan is unmistakable, obvious, impossible to un-hear. Believers took that jump as proof the message was there all along. It is actually proof of something about the listener.

The effect is priming, driving the same over-eager pattern engine that finds coded confessions in a Kubrick film, a machinery examined at length in the story of Room 237. Human hearing is not a passive microphone. It is a prediction system that takes a smeared, ambiguous signal and forces it into the nearest familiar shape, and it leans heavily on expectation to do so. Reversed speech is a stream of sounds that never quite settles into words, precisely the kind of ambiguous input the system will happily resolve if you hand it a template. Give it the sentence in advance and it snaps the mush to fit, the way a suggested word makes a mumbled lyric suddenly clear. The words are not in the record. The words are in the caption, and the ear is doing what it always does, which is guess.

Once you understand priming, the whole demonstration inverts. The believer thinks the screen simply reveals what was hidden. What the screen actually does is install the pattern the ear then obediently hears. It is the same trick, in sound, as the spelling everyone misremembers: a mind handed an expectation quietly rebuilds the evidence to match it, and feels certain the whole time.

The trial that put a reversed word on the stand

The panic reached its strangest and saddest peak in a Nevada courtroom in 1990. In 1985 two young men in Sparks, Nevada, Raymond Belknap and James Vance, had spent an afternoon drinking and smoking and listening to the Judas Priest album Stained Class, and then gone to a churchyard with a shotgun. Belknap died at once. Vance survived, terribly injured, and died three years later. Their grieving families, and their lawyers, brought a suit against Judas Priest and their record company, arguing that the album contained a hidden subliminal command, the words do it, buried in the track “Better by You, Better Than Me”, and that this command had driven the two young men to the gun.

The trial ran for weeks. The band flew in. Their singer, Rob Halford, sat in the witness box and sang passages from the record forwards and backwards to show how ordinary vocal sounds throw off accidental phrases in reverse. The defence demonstrated that you could find all manner of unintended “words” in the reversed audio of almost any song, because a long enough stream of phonemes will always, by chance, throw up something that resembles speech to a mind that is hunting. The judge, Jerry Carr Whitehead, ruled that the alleged do it was not deliberately placed and, crucially, that no reliable science supported the claim that a subliminal message of that kind could compel a person to act. The case failed. What lingers is not the verdict but the spectacle: a grief so unbearable that it went looking for an author, and a courtroom that spent weeks playing a heavy-metal record backwards because two families needed the deaths of their sons to mean something other than what they were.

What the panic was really about

That courtroom holds the answer to why the whole thing caught fire, and it is not really about music at all. The backmasking scare arrived in the early 1980s, at a moment of sharp anxiety among American parents about a culture their children now inhabited and they did not. Rock music was loud, sexual, occasionally genuinely provocative, and it came into the house on records the parents could not fully hear or understand. The fear that something dangerous was being transmitted to your child, past your authority, in a code you could not crack, is a very old fear wearing a new sleeve. Backmasking gave it a mechanism and a villain. It said: the danger is real, it is deliberate, it has a name, and it is hidden in the grooves.

That is why the technical debunking, though complete, never quite killed it. When you tell a frightened parent that reversed audio carries no subliminal meaning, you have answered a question they were not truly asking. The real question underneath was whether they had lost their children to a world they could not govern, and the answer to that was, in the ordinary way of adolescence, partly yes. The Devil in the B-side was a way of naming a loss of control and locating it somewhere it could be fought, in an album that could be snapped in half on a bonfire.

Belief in Satanic backmasking has faded, though it never entirely dies, because the underlying machinery never goes anywhere. The ear still resolves ambiguity into expectation. Grief still hunts for an author. And a culture worried about what is reaching its children through channels it cannot monitor will always be ready to believe that a message has been hidden where it cannot quite hear it. The records were real, the technique was real, and a handful of bands really did tuck jokes into the reverse. Everything cruel and frightening that grew on top of that seed was assembled, note by note, by the listeners themselves, standing at the turntable, spinning the record the wrong way, hearing exactly what they had been told to fear.