I–IV–♭VII–I in B♭ Major

Pattern: I – IV – ♭VII – I Chords: B♭ – E♭ – A♭ – B♭

Chord Breakdown

Numeral	Chord	Type	Function
I	B♭ (details)	major	Tonic
IV	E♭ (details)	major	Subdominant
♭VII	A♭ (details)	major	Subtonic
I	B♭ (details)	major	Tonic

Harmonic Analysis

This progression moves through B♭ (Tonic) → E♭ (Subdominant) → A♭ (Subtonic) → B♭ (Tonic).

A modal vamp built on the Mixolydian scale, using the characteristic ♭VII chord for a rock-influenced jazz flavor. This progression works well for modal jazz improvisation and funk-jazz fusion.

Song Examples

Chameleon — Herbie Hancock
Cissy Strut — The Meters

Chord Details

B♭ E♭ A♭

More Progressions in B♭ 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