Listen plays the chord. Play Along lights up each note in order so you can follow.
A♯9♯5
A♯ – C♯♯ – E♯♯ – G♯ – B♯
Formula:R-M3-A5-m7-M9
Intervals:P1-M3-A5-m7-M9
Scale Degrees:1-3-#5-b7-9
Introduction
The A# 9♯5 chord in root position on a piano keyboard, notes A#, D, F#, G#, C.
The A♯ 9♯5 chord is a five-note chord made up of A♯, C♯♯, E♯♯, G♯, and B♯. It is built from a root, major third, augmented fifth, minor seventh, and major ninth.
Notes
Notes:A♯ – C♯♯ – E♯♯ – G♯ – B♯
Key Signature
The key of A# 9♯5 (enharmonically equivalent to Bb 9♯5) 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:
The A♯ 9♯5 is built by stacking intervals from the root note. The formula R-M3-A5-m7-M9 describes the scale degrees used. The intervals P1-M3-A5-m7-M9 show the distance between each note in the chord.
A♯ 9♯5 — Frequently Asked Questions
What notes are in the A# 9♯5 chord?
The A# 9♯5 chord (A#9♯5) contains 5 notes: A#, D, F#, G#, C. Formula: R-M3-A5-m7-M9.
How is A#9♯5 used in music?
A#9♯5 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♯5?
A#9♯5 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♯5 slowly with separate hands before combining.
Listen carefully to the tension created by the altered tones in this chord.
Try voicing A#9♯5 in different octaves to find the most comfortable position.
Resolve A#9♯5 to a nearby chord to hear its function in context.
Keep going with the 9♯5 chord — these pages cover the underlying theory, the connected reference material, and the practice tools that work with this chord.
