I+7–IV in A♭ Major

Pattern: I+7 – IV Chords: Abaug7 – D♭

Chord Breakdown

Numeral	Chord	Type	Function
I+7	Abaug7 (details)	augmented seventh	Tonic
IV	D♭ (details)	major	Subdominant

Harmonic Analysis

This progression moves through Abaug7 (Tonic) → D♭ (Subdominant).

The I+7–IV progression treats the tonic as a secondary dominant with augmented coloring, creating a chromatic approach to the subdominant. The augmented seventh chord combines the raised fifth's upward pull with the flat seventh's dominant function, creating a powerful forward motion toward IV. This is common in blues and jazz where the I chord is often treated as a dominant seventh moving to IV.

Song Examples

Stormy Monday — T-Bone Walker
Red House — Jimi Hendrix
Baby What You Want Me to Do — Jimmy Reed

Chord Details

Abaug7 D♭

More Progressions in A♭ 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

Related Progressions

Iaug–IV Vaug7–I I7–IV7