Abadd9

General info

Full name

Ab Add9

Symbol

Abadd9

Root

Ab

Quality

Add9

Chord notes

Functions & resolutions

Typical function in key

VDominant (V)C# major

Stability / tension

Stable — can serve as major tonic

Most common resolutions

DbDb MajorEbEb MajorFmF Minor

Main resolution

Abadd9source

EbEb Major

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

Other resolutions

Abadd9source

Deceptive resolution

FmF Minor

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

Abadd9source

Modal resolution

GbGb Major

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

Abadd9source

Jazz reharmonization

Abmaj7Ab 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).

Abadd9source

Functional resolution

EbEb Major

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

Features

Character

Major, with an added 9th and no 7th

Characteristic interval

9th without 7th (add9)

Description

A major 9th is added to a major triad without a 7th. The chord retains a simple triadic core while adding second-based tension between root and 9th.

Application

• Added-tone major tonic
• Pop and rock
• Arpeggiated textures

Voicing & structure

Harmony

Compatible scales

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