---
schema: 1
type: term
title: _A-flat add nine_
description: >-
  **_A-flat add nine_** is a chord built on an A-flat root: a basic A-flat triad
  with an added **ninth** — the note a ninth above the root — layered on top,
  which adds color without changing the chord's basic function.
canonical: >-
  https://liquidgold.cc/channel/everyinc/explore/term/a-flat-add-nine-1f2b8c65f4d3
markdown: >-
  https://liquidgold.cc/channel/everyinc/explore/term/a-flat-add-nine-1f2b8c65f4d3.md
llms: null
parent: 'https://liquidgold.cc/channel/everyinc/llms.txt'
channel: everyinc
updated: '2026-10-23T22:12:35.346Z'
language: null
children: []
---


# \_A-flat add nine\_

Canonical: https://liquidgold.cc/channel/everyinc/explore/term/a-flat-add-nine-1f2b8c65f4d3

Parent: [Channel index](https://liquidgold.cc/channel/everyinc/llms.txt)

## Definition

**_A-flat add nine_** is a chord built on an A-flat root: a basic A-flat triad with an added **ninth** — the note a ninth above the root — layered on top, which adds color without changing the chord's basic function.

_A-flat add nine_ shows up in this channel's piano material as the name of a specific **chord** — an A-flat triad with a **ninth** added on top. In the video *Codex Taught Me How to Play Piano*, the term is used in the context of a live lesson, where the assistant walks through piano playing and music theory in real time, naming chords as they are played so the sound and the label are explored together.