Progression
The I–IV–V in Bb major
I–IV–V in Bb major plays Bb, Eb and F — 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
1BbI
2EbIV
3FV
4BbI
I–IV–V in Bb major plays Bb, Eb and F — I, IV and V — across 4 chords. The three-chord song — folk, country and early rock's whole harmonic vocabulary in one loop.