Progression
The I–IV–V in G major
I–IV–V in G major plays G, C and D — I, IV and V — across 4 chords. The three-chord song — folk, country and early rock's whole harmonic vocabulary in one loop.
The chords, in order
1GI
2CIV
3DV
4GI
I–IV–V in G major plays G, C and D — I, IV and V — across 4 chords. The three-chord song — folk, country and early rock's whole harmonic vocabulary in one loop.