Ab Dominant 7th
Introduction
Enharmonic equivalent: A♭ is enharmonically equivalent to G♯. See G# Dominant 7th.
Notes
Ab Dominant 7th Inversions
| Position | Notes |
|---|---|
| Root Position | Ab4 – C5 – Eb5 – Gb5 |
| 1st Inversion | C5 – Eb5 – Gb5 – Ab5 |
| 2nd Inversion | Eb5 – Gb5 – Ab5 – C6 |
| 3rd Inversion | Ab4 – C5 – Eb5 – Gb4 |
Key Signature
The key of Ab Dominant 7th has 4 flats: B♭, E♭, A♭, D♭.
Theory: Intervals
The Ab Dominant 7th is built by stacking intervals from the root note. The formula R-M3-P5-m7 describes the scale degrees used. The intervals P1-M3-P5-m7 show the distance between each note in the chord.
Ab Dominant 7th — Frequently Asked Questions
What notes are in the Ab Dominant 7th chord?
The Ab Dominant 7th chord (Ab7) contains four notes: Ab (root), C (major third), Eb (perfect fifth), and Gb (minor seventh). The major triad with a minor seventh creates the dominant 7th's characteristic tension and forward drive.
How does Ab Dominant 7th differ from Ab Major?
Ab Major contains three notes: Ab, C, Eb. Ab Dominant 7th adds a Gb (minor seventh) on top. That one note transforms a stable chord into one with strong harmonic pull — it wants to resolve down a fifth to Db Major.
What does 'dominant' mean in music theory?
'Dominant' refers to the fifth scale degree. The dominant 7th chord is built on the fifth note of a key and contains a tritone that creates strong pull toward resolution. Ab7 is the dominant chord in the key of Db Major.
How is Ab Dominant 7th used in music?
Ab7 most commonly resolves to Db Major in a V7–I cadence. It appears frequently in jazz, R&B, and gospel — Db Major is a common key for vocalists. Ab7 also functions as a tritone substitution for D7, since both share the same tritone (C and Gb/F#).
What songs use dominant 7th chords?
Dominant 7th chords are the backbone of blues and early rock: every chord in a standard 12-bar blues is a dominant 7th. Hit the Road Jack (Ray Charles), Ain't Misbehavin' (Fats Waller), and countless jazz standards rely on dominant 7th movement for their harmonic drive.
What is the tritone in Ab Dominant 7th?
The tritone in Ab7 is the interval between C (the third) and Gb (the seventh) — exactly 6 semitones apart. This unstable interval gives Ab7 its strong pull toward Db. The C resolves up to Db and the Gb resolves down to F.
Practice Tips
- Play Ab Major then add Gb — hear the instant shift from stability to forward motion.
- The tritone between C and Gb is the engine of Ab7. Play just those two notes, then resolve: C up to Db, Gb down to F. This is V7–I voice leading.
- Practice the essential resolution: Ab7 → Db Major. Master this in root position and all inversions for smooth transitions.
- Jazz ii–V–I in Db: Ebm7 → Ab7 → Dbmaj7. This progression appears in countless jazz standards — make it fluid at different tempos.
- Compare Ab7 with Abm7 — the major third (C) in Ab7 provides brightness and urgency, while the minor third in Abm7 creates a darker sound.
- Rootless voicing: play C–Eb–Gb without the Ab root — this sparse voicing is standard for jazz piano comping.