Bbdim(maj7)

General info

Full name

Bb Diminished major 7

Symbol

Bbdim(maj7)

Root

Bb

Quality

Diminished major 7

Chord notes

Functions & resolutions

Stability / tension

Stable — can serve as major tonic

Most common resolutions

EbEb MajorFF MajorGmG Minor

Unstable degrees

4Eb

b5E

resolves inward to the 4th

7A

1Bb

resolves up to the root

Main resolution

Bbdim(maj7)source

FF Major

Major chord Bb is a stable tonic. As tonic it doesn't require resolution, but in a progression context typically moves to IV or V.

Other resolutions

Bbdim(maj7)source

Deceptive resolution

GmG Minor

As the V degree, a major chord can defy expectations by moving to vi instead of I (deceptive cadence).

Bbdim(maj7)source

Modal resolution

AbAb Major

In modal context, a major chord can freely move to bVII, bIII, or bVI — characteristic of Mixolydian mode.

Bbdim(maj7)source

Jazz reharmonization

Bbmaj7Bb Major 7

In jazz, a major chord is enriched to maj7, 6/9, or add9 and can smoothly transition into a ii-V of another key (modulation).

Bbdim(maj7)source

Functional resolution

FF Major

As the IV degree (subdominant), a major chord can resolve to V or directly to I (plagal cadence).

Features

Character

Diminished, with a major 7th

Characteristic interval

Minor 3rd (m3), Diminished 5th (b5), Major 7th (M7)

Description

The minor 3rd and diminished 5th form a diminished triad, while the major 7th adds semitone tension toward the octave. Two independent dissonances make the chord sharply unstable.

Application

• Chromatic harmony
• Rare passing sonorities
• Modern classical and jazz music

Voicing & structure

Harmony

Compatible scales

All chord tones are contained in these scales — use them for improvisation.