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