The Sabbath Sound — How Black Sabbath Invented Heavy and Doom

A history of the dropped tunings, tritone riffs, and tube distortion that built metal.

Heavy didn't exist before 1970. Then Tony Iommi, with fingertips shortened by a factory accident, down-tuned his SG, dialed in a Laney full of harmonic distortion, and wrote the riff to 'Iron Man.' Doom, metal, and every heavy subgenre since trace back to that afternoon, and the story of how it happened is the story of how a working-class band from Birmingham, England, invented the sound that would define heavy music for the next half-century. We trace the Sabbath sound from the Birmingham steel-town gloom to its modern heirs — the doom, stoner, and sludge bands still worshiping the tritone half a century later — and the story is the one that every heavy band since has been, knowingly or not, retelling.

The accident is the part everyone gets wrong. Iommi was 17, working in a sheet-metal factory in Birmingham, when the last day of his job — he was about to quit to play guitar full-time — he cut the tips off his middle and ring fingers on his right hand in a press. He was right-handed, so the injury was to his fretting hand, and the doctors told him he'd never play again. He did what any working-class Birmingham kid would do: he melted down a Fairy Liquid bottle, fashioned thimbles for the severed fingertips, detuned the guitar to make the strings lighter, and taught himself to play with the thimbles. The detuning — dropping the low E to C# and later to B — is the thing that gave the Sabbath sound its weight, and it's the thing that every heavy band since has been imitating. The accident didn't end the career. It invented the genre.

The gear is the part that made the sound. Iommi's guitar was a Gibson SG Standard — a guitar he'd chosen because the thin neck was easier on his injured hand — and his amp was a Laney Supergroup, a British tube amp that was, at the time, the loudest amp in Birmingham. The combination — a down-tuned SG through a dimed Laney — is the sound that defined the Sabbath records, and it's the sound that every doom and stoner band since has been chasing. Iommi also used a Dallas Rangemaster treble booster, a device that pushed the amp's preamp into a fuller distortion, and a custom-made set of lighter-gauge strings that he could bend with the thimbles. The gear was not a choice — it was a necessity, forced by the injury — and the necessity is the thing that made the sound. The Sabbath tone is the sound of a man playing around a disability, and it's the sound that every heavy band since has been trying to copy.

The riffs are the part that made the genre. The 'Iron Man' riff — a down-tuned, tritone-based, single-note figure — is the riff that every metal guitarist still learns first, and it's the riff that taught the genre that a single note, played heavy and sustained, was a riff. The 'Paranoid' riff — a faster, more driving figure — is the one that taught the genre that heavy could be fast. The 'War Pigs' riff — a slower, more deliberate figure — is the one that taught the genre that heavy could be slow. And the 'Sweet Leaf' riff — a down-tuned, fuzz-drenched figure — is the one that taught the genre that heavy could be stoned. The four riffs, all written in the same 18-month period between 1969 and 1970, are the riffs that defined the genre, and the riffs that every heavy band since has been, knowingly or not, stealing from.

The tritone is the part that made it heavy. The tritone — the interval between a perfect fourth and a perfect fifth, the 'devil's interval' that was banned by the medieval church — is the interval that Iommi built his riffs around, and it's the interval that gives the Sabbath sound its dread. The 'Black Sabbath' riff — a tritone-based, down-tuned, single-note figure — is the one that taught the genre that a single note, played heavy and sustained, could be a horror movie. The tritone is the thing that made the Sabbath sound evil, and the evil is the thing that made the genre. Every doom, stoner, and sludge band since has been worshiping the tritone, and the tritone is the thing that Tony Iommi, with his severed fingertips and his down-tuned SG, gave them.

We trace the Sabbath sound from the Birmingham steel-town gloom to its modern heirs — the doom, stoner, and sludge bands still worshiping the tritone half a century later, and the whole story is the one that every heavy band since has been retelling. The accident, the gear, the riffs, and the tritone are the four things that made the sound, and the sound is the thing that made the genre. Heavy didn't exist before 1970. Then a working-class kid from Birmingham severed his fingertips in a factory accident, down-tuned his guitar to play around it, and wrote the riff that invented heavy. Doom, metal, and every heavy subgenre since trace back to that afternoon — and the whole thing started with a disability and a down-tune.