I–III–IV–iv in G Major

Pattern: I – III – IV – iv Chords: G – B – C – Cm

Chord Breakdown

Numeral	Chord	Type	Function
I	G (details)	major	Tonic
III	B (details)	major	Mediant
IV	C (details)	major	Subdominant
iv	Cm (details)	minor	Subdominant

Harmonic Analysis

This progression moves through G (Tonic) → B (Mediant) → C (Subdominant) → Cm (Subdominant).

The I–III–IV–iv progression features a chromatic ascent from I to IV via a secondary dominant III, then darkens with a borrowed minor iv. The III chord (V/vi) adds unexpected brightness while the iv creates a ♭ittersweet descent. This pattern appears in classic rock and singer-songwriter music.

Song Examples

Something — The Beatles
My Girl — The Temptations

Chord Details

G B C Cm

More Progressions in G Major

I–IV–V–I I–V–vi–IV I–vi–IV–V ii–V–I I–IV–V I–♭VII–IV vi–IV–I–V I–V–vi–iii–IV–I–IV–V I–IV I–V IV–V IV–I