Key
A (A Major)
Tempo / BPM
Tempo: Not available
Tuning
Standard
Time Signature
4/4
Difficulty Level
Very Easy
Capo Position
Capo Fret 4
Chord Count
6 Unique Chords
Genre
Australian Rock
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Big Gun by AC/DC is played in the key of A. Originally recorded in the sounding key of A, 'Big Gun' by AC/DC is best approached with a Capo placed on Fret 4, enabling guitarists to execute friendly F shapes while fully preserving the studio pitch. The song relies exclusively on open cowboy chords (E5, G5, A5, C5, D5, B5), letting beginners concentrate on tone clarity, ringing string resonance, and sustain without encountering demanding barre finger fatigue. The primary progression challenge lies in switching between E5 and G5: keep your fingers hovering close to the fretboard rather than flying off between changes. Set your metronome at an initial practice tempo of 66 BPM in 4/4 time to master the '↓ - ↓ ↑ - ↑ ↓ ↑' strumming groove, emphasizing steady downstrokes on beats one and three before accelerating toward the studio speed of 92 BPM.