I–V–vi–IV progression
The I–V–vi–IV progression is a common chord progression popular across several music genres. It uses the I, V, vi, and IV chords of the diatonic scale. For example, in the key of C major, this progression would be C–G–Am–F. Rotations include:
- I–V–vi–IV: C–G–Am–F
- V–vi–IV–I: G–Am–F–C
- vi–IV–I–V: Am–F–C–G
- IV–I–V–vi: F–C–G–Am
The '50s progression uses the same chords but in a different order (I–vi–IV–V), no matter the starting point.