Progression
The I–IV–V in Ab major
I–IV–V in Ab major plays Ab, Db and Eb — 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
1AbI
2DbIV
3EbV
4AbI
I–IV–V in Ab major plays Ab, Db and Eb — I, IV and V — across 4 chords. The three-chord song — folk, country and early rock's whole harmonic vocabulary in one loop.