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-A9
Intervals:P1-M3-P5-m7-A9
Scale Degrees:1-3-5-b7-#9
Introduction
The A# 7♯9 chord in root position on a piano keyboard, notes A#, D, F, G#, C#.
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 augmented ninth.
Notes
Notes:A♯ – C♯♯ – E♯ – G♯ – B♯♯
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:
The A♯ 7♯9 is built by stacking intervals from the root note. The formula R-M3-P5-m7-A9 describes the scale degrees used. The intervals P1-M3-P5-m7-A9 show the distance between each note in the chord.
Keep going with the 7♯9 chord — these pages cover the underlying theory, the connected reference material, and the practice tools that work with this chord.
