vii°7–I in B♭ Major

Pattern: vii°7 – I Chords: Adim7 – B♭

Chord Breakdown

Numeral	Chord	Type	Function
vii°7	Adim7 (details)	diminished seventh	Subtonic
I	B♭ (details)	major	Tonic

Harmonic Analysis

This progression moves through Adim7 (Subtonic) → B♭ (Tonic).

The vii°7–I progression uses the fully diminished seventh chord on the leading tone for a dramatic resolution to the tonic. The diminished seventh chord's symmetrical structure (four notes equally spaced by minor thirds) creates maximum tension and ambiguity, making it one of the most emotionally charged cadences in Western music. It is a hallmark of classical drama and film suspense.

Song Examples

While My Guitar Gently Weeps — The Beatles
Phantom of the Opera — Andrew Lloyd Webber
Sophisticated Lady — Duke Ellington

Chord Details

Adim7 B♭

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

Related Progressions

viidim–I sharpivdim7–V V7–I