A♯ 7♭9
Also known as B♭ 7♭9
Same keys, different spelling.
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Listen plays the chord. Play Along lights up each note in order so you can follow.
A♯7♭9
A♯ – C♯♯ – E♯ – G♯ – B
Formula:R-M3-P5-m7-m9
Intervals:P1-M3-P5-m7-m9
Scale Degrees:1-3-5-b7-b9
Introduction
The A♯ 7♭9 chord is a five-note chord made up of A♯, C♯♯, E♯, G♯, and B. It is built from a root, major third, perfect fifth, minor seventh, and minor ninth.
Notes
Key Signature
The key of A# 7♭9 (enharmonically equivalent to Bb 7♭9) has 2 flats.
B♭E♭
Order of flats
Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.
B♭E♭A♭D♭G♭C♭F♭
Mnemonic: Battle Ends And Down Goes Charles’ Father
Chords in the Key of A♯ Major
These are the diatonic triads built on each degree of the A♯ major scale:
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — A♯ Major (major)
Theory: Intervals
Formula: R-M3-P5-m7-m9
Intervals: P1-M3-P5-m7-m9
The A♯ 7♭9 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♯ 7♭9 — Frequently Asked Questions
What notes are in the A# 7♭9 chord?
The A# 7♭9 chord (A#7♭9) contains 5 notes: A#, D, F, G#, B. Formula: R-M3-P5-m7-m9.
How is A#7♭9 used in music?
A#7♭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#7♭9?
A#7♭9 uses scale degrees 1-3-5-b7-b9, giving it its distinctive sound.
Practice Tips
- Start by placing your thumb on A# and spacing remaining fingers across the chord.
- Practice A#7♭9 slowly with separate hands before combining.
- Listen carefully to the tension created by the altered tones in this chord.
- Try voicing A#7♭9 in different octaves to find the most comfortable position.
- Resolve A#7♭9 to a nearby chord to hear its function in context.
Related Tools
Chord FinderLook up any chord — see the notes, hear it, and play along.Chord DrillTimed drills to build speed and recognition across all chord types.Practice RoomPlug in a MIDI keyboard and get real-time feedback on every chord and scale.Circle of FifthsVisualize key relationships, relative minors, and key signatures.MIDI MonitorLive MIDI message stream with note names, velocity, and a scrolling staff.