Thunderstruck
by AC/DC
Difficulty Profile
Skill LevelOverall
AdvancedRhythm
AdvancedLead
ExpertBass
IntermediateWhy "Thunderstruck" Works Harmonically
Beyond standard guitar tabs and chord charts, discover the exact music theory mechanics, modal interchange, and voice leading choices that give AC/DC's classic its unforgettable emotional power.
The High-Velocity Open B String Pedal Tone Drone
The iconic intro is a masterclass in pedal-point mechanics: Angus frets moving notes along the B string while continuously pulling off to the ringing open B string. Because the open B drone never stops ringing, it anchors the modal journey from B Mixolydian to B Dorian with electric tension before the drums even enter.
Harmonic Progression (Roman Numerals)
I - ♭VII - IV (implied over drone)Step-by-Step Movement
- •Open B Drone: The stationary harmonic anchor vibrating through every single eighth note.
- •Mixolydian Melody (Frets 4, 7, 5, 8, etc.): Ascending and descending scale notes clashing against the drone.
- •Dorian Shift (Fret 10 / A natural): Modal interchange adding blues aggression to the second half of the riff.
- •B5 - A5 - E5: Explosive arena power chord entry confirming the implied Mixolydian harmony.
Voice Leading & Counterpoint
- ›The open B string acts as an acoustic pedal point, creating dynamic intervals (unisons, 2nds, 3rds, 4ths, 5ths) with every fretted note.
- ›Because every fretted note alternates with an open string, the harmonic rhythm feels twice as fast as the actual chord changes.
- ›When the full band slams in, the open drone is absorbed into massive low-end power chords.
Fretboard Mechanics
Play the riff on a single string (the B string) using alternate picking or pure hammer-ons/pull-offs. Keep your fretting hand fingers curled high to prevent accidentally muting the open B string.
Anchor one open string as a continuous drone and write your lead melody on that same string. It creates mesmerizing, high-energy momentum with zero backing instruments.
The scale defining the bright first half of the intro riff.
The mode providing the bluesy second half of the intro.
The modal engine behind the anthemic chorus.
The massive B5, A5, and E5 chorus chords.
The primary cadence of the chorus.
Musical Analysis
🎹 Key & Tonality
⏱️ Song Structure
💡 Understanding B major:
B major has a bright, uplifting character typical of major keys. The Ionian (Major) mode gives it a stable, resolved feeling. This key works well for anthemic rock songs and creates a powerful, confident mood.
Primary Chords Used
Scale Patterns in B major
B major scale
Notes: B - C# - D# - E - F# - G# - A# - B
Application: Primary harmonic foundation for chord progressions
Interactive Fretboard Map
Chord Progressions & Movement
Main Progression
Classic I-IV-V power chord progression forming the backbone of the song
💡 Theory Insight:
The I-IV-V progression is the foundation of rock, blues, and countless other genres. The I chord (tonic) establishes home, IV (subdominant) creates movement, and V (dominant) builds tension that resolves back to I.
Chord Shapes In This Section:
B5
E5
F#5
Harmonic Functions & Roles:
- B5 (I)Establishes strong tonic center in B major
- E5 (IV)Provides subdominant movement and harmonic contrast
- F#5 (V)Creates dominant tension that resolves back to B5
- A5 (♭VII)Borrowed from B minor, adds classic rock character
Key Techniques
Left-Hand Tapping
AdvancedAngus Young's signature left-hand tapping creates the iconic opening
Technique Tips:
- •Use fingertips to 'hammer' onto frets
- •Quick, percussive tapping motion
- •No picking hand required for intro
- •Creates distinctive staccato sound
Power Chords
IntermediateMain rhythm section uses classic power chord progression
Uses chords:
Progression:
B5 - E5 - F#5 - B5
Practice Exercises
Scale and technique exercises in the key of B major. Switch instrument sounds (Acoustic Steel, Nylon, Clean Electric, Piano) and practice at your own tempo.
Intro
Iconic B-String Pull-Off Riff
Iconic left-hand tapping sequence on high E string
- •Single-note tapping sequence
- •Left-hand only - no picking
- •Consistent eighth-note rhythm
Verse
Driving B5-A5-E5 Rhythm
Power chord progression with palm muting
- •Down-picking recommended
- •Palm muting for tight sound
- •Steady quarter-note rhythm
Chorus
Chorus Power Chords
Combination of power chords and open positions
- •More dynamic strumming
- •Combination of muted and open chords
- •Build energy and intensity
Equipment & Tone Setup
🎸 Guitar
Recommended Model:
Pickup Type:
Humbucker pickups for thick, sustaining tone
Alternative Models:
⚡ Amplifier & Settings
Recommended Amp:
Tone Stack Dial-In:
Gain: 7-8/10
Treble: 7/10
Middle: 6/10
Bass: 5/10
Presence: 6/10
Alternative Amps:
🎛️ Effects Pedals
Overdrive / Distortion:
High-gain overdrive/distortion
Reverb / Delay:
Minimal - just amp reverb
Modulation / Other:
Optional: Noise gate for clean stops
Recommended Learning Path
Getting Started
⏱️ 2-4 weeks
- •Learn B5, E5, F#5 power chords
- •Practice chord progression slowly
- •Basic left-hand tapping technique
- •Work on timing with metronome
Building Skills
⏱️ 4-8 weeks
- •Master the intro left-hand tapping
- •Combine tapping and strumming
- •Work on dynamics and accents
- •Learn complete song structure
Mastery Goals
⏱️ 8-12 weeks
- •Perfect the intro at full tempo
- •Add lead guitar embellishments
- •Master the complete arrangement
- •Perform with AC/DC energy and precision
Practice Notes & Routine
⚠️ Common Mistakes to Avoid
- •Using pick for intro (should be left-hand only)
- •Rushing the tapping sequence
- •Inconsistent left-hand pressure
- •Poor chord transitions in rhythm sections
⏱️ Targeted Practice Routine
- •Warm up with chromatic exercises
- •Practice left-hand tapping slowly
- •Work on power chord changes
- •Play along with backing track
- •Record yourself for self-assessment
⏱️ Metronome Drills
- •Start at 60 BPM for tapping intro
- •Gradually increase to 133 BPM
- •Practice with subdivision clicks
- •Focus on staying in time