A# Dominant 9th
Notes:A# – D – F – G# – C
Formula:R-M3-P5-m7-M9
Intervals:P1-M3-P5-m7-M9
Scale Degrees:1-3-5-b7-9
Introduction
The A# Dominant 9th piano chord (A#9) consists of the notes A#, D, F, G#, C. Formula: R-M3-P5-m7-M9 | Scale degrees: 1-3-5-b7-9.
Enharmonic equivalent: A♯ is enharmonically equivalent to B♭. See Bb Dominant 9th.
Notes
A# Dominant 9th Inversions
| Position | Notes |
|---|---|
| Root Position | A#4 – D5 – F5 – G#5 – C6 |
| 1st Inversion | D4 – F4 – G#4 – C5 – A#5 |
| 2nd Inversion | F4 – G#4 – C5 – A#5 – D6 |
Key Signature
The key of A# Dominant 9th has Key signature data not available.
Theory: Intervals
Formula: R-M3-P5-m7-M9
Intervals: P1-M3-P5-m7-M9
The A# Dominant 9th is built by stacking intervals from the root note. The formula R-M3-P5-m7-M9 describes the scale degrees used. The intervals P1-M3-P5-m7-M9 show the distance between each note in the chord.
A# Dominant 9th — Frequently Asked Questions
What notes are in the A# Dominant 9th chord?
The A# Dominant 9th chord (A#9) contains 5 notes: A#, D, F, G#, C. Formula: R-M3-P5-m7-M9.
How is A#9 used in music?
A#9 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for A#9?
A#9 uses scale degrees 1-3-5-b7-9, giving it its distinctive sound.
Practice Tips
- Start by placing your thumb on A# and spacing remaining fingers across the chord.
- Practice A#9 slowly with separate hands before combining.
- Listen carefully to the tension created by the altered tones in this chord.
- Try voicing A#9 in different octaves to find the most comfortable position.
- Resolve A#9 to a nearby chord to hear its function in context.