Bb13b9

General info

Full name

Bb 13b9

Symbol

Bb13b9

Root

Bb

Quality

13b9

Chord notes

Functions & resolutions

Typical function in key

VDominant (V)Eb major

Stability / tension

Stable — can serve as major tonic

Most common resolutions

EbEb MajorFF MajorGmG Minor

Unstable degrees

4Eb

b7Ab

resolves down to the resolution tonic

Main resolution

Bb13b9source

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

Bb13b9source

Deceptive resolution

GmG Minor

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

Bb13b9source

Modal resolution

AbAb Major

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

Bb13b9source

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).

Bb13b9source

Functional resolution

FF Major

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

Substitutions

Tritone substitution

E7E Dominant 7

Features

Character

Dominant, with b9 and 13th

Characteristic interval

Minor 9th (b9), 13th

Description

The minor 9th sharpens dominant tension, while the major 13th adds a consonant extension. The contrast between b9 and 13 makes the chord dense while preserving a clear dominant function.

Application

• V13b9 → i in minor
• Latin jazz
• Advanced jazz cadences

Voicing & structure

Harmony

Compatible scales

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