The Guitar Plugged · Guitarist Index
Tony Iommi
Black Sabbath
1966–present
Metal · Rock · Blues
The inventor of heavy metal guitar, built out of an industrial accident.
Main guitar
Gibson SG ('Monkey'), and the Jaydee Custom 'Old Boy'
Signature sound
Downtuned SG through treble-boosted Laney amps — dark, thick and doom-laden
Era
1966–present
Influence
97 / 100
Genre
Metal / Rock / Blues
Why they matter
The inventor of heavy metal guitar, built out of an industrial accident.
Iommi lost the tips of two fretting fingers in a sheet-metal factory on his last day of work. The prosthetic thimbles he made from a melted washing-up-liquid bottle could not feel the strings, so he detuned to reduce tension and used light-gauge strings — and in doing so accidentally created the tonal foundation of heavy metal.
What he built on top of that is more deliberate. Sabbath riffs use the tritone, unresolved intervals and slow tempos to create dread, at a time when heavy music mostly meant fast blues. 'Black Sabbath', 'Iron Man' and 'Symptom of the Universe' between them contain the DNA of doom, thrash and stoner rock.
Fifty years on, the riff writing is still the reference point — including for players who have never listened to a full Sabbath album.
The sound
Downtuned SG through treble-boosted Laney amps — dark, thick and doom-laden
Black Sabbath
Sparse, reverberant and almost clean in places — the horror comes from the interval and the space, not the gain.
Iron Man
Rangemaster into Laney: mid-forward and grinding, with the riff doubled by bass to make it immovable.
Symptom of the Universe
The proto-thrash tone — tighter, faster and more aggressive than anything else in 1975.
Heaven and Hell
The Dio-era refresh: cleaner low end, more sustain, arena-scale rather than basement-scale.
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Style & technique
How you recognise the playing
Tritone-based riffing
The 'devil's interval' used as a compositional device, giving the riffs their unresolved menace.
Downtuning
C♯ and later tunings adopted for physical necessity and kept because of the weight they added.
Bluesy lead over heavy rhythm
Solos rooted in British blues phrasing sitting on top of far heavier backing than the vocabulary was designed for.
Fast, wide vibrato
A nervy, urgent vibrato that keeps single notes alive above the sludge.
The rig
Instruments, amplification and effects
- Gibson SG Special 'Monkey'
- Jaydee Custom SG 'Old Boy'
- Gibson Iommi signature SG
- Laney Supergroup 100
- Laney GH100TI signature
- Marshall (early Sabbath live)
- Dallas Rangemaster treble booster (modified by Iommi)
- Tycobrahe Parapedal wah
- Boss chorus and delay (1980s onward)
- John Birch and later Gibson Iommi humbuckers
- Homemade leather fingertip thimbles
- Extra-light gauge strings, banjo strings in the early years
Essential listening
Where to start
- 011970
Black Sabbath
Black Sabbath · Black Sabbath
- 021970
Iron Man
Black Sabbath · Paranoid
- 031970
War Pigs
Black Sabbath · Paranoid
- 041971
Sweet Leaf
Black Sabbath · Master of Reality
- 051975
Symptom of the Universe
Black Sabbath · Sabotage
- 061980
Heaven and Hell
Black Sabbath · Heaven and Hell
Career landmarks
The moments that mattered
The factory accident
A workplace injury that forced the detuning and light strings which became metal's tonal foundation.
Master of Reality
The first album recorded with the guitars tuned down three semitones — the origin point for doom and stoner rock.
Fifty years of riffs
Sabbath's catalogue remains the most-mined riff library in heavy music.
The legacy
Lineage
Influenced by
Django Reinhardt
Hank Marvin
John Mayall-era blues
Influenced
Adjacent players
More from the archive
The player who turned amplifier noise into a musical language.
The virtuoso who rewrote the vocabulary of rock guitar.
Session-hardened producer who built rock guitar as an architecture, not a solo.
The player who translated Chicago blues into British rock volume.
The restless technician who kept reinventing what an electric guitar could be.
The master of the long note — space, sustain and perfect note choice.