A♯ Major 9th
Also Known As
Hear the A♯ Major 9th chord played for you.
A♯maj9
A♯ – D – F – A – C
Formula:R-M3-P5-M7-M9
Intervals:P1-M3-P5-M7-M9
Scale Degrees:1-3-5-7-9
Introduction
The A♯ Major 9th chord is a five-note chord made up of A♯, D, F, A, and C. It is built from a root, major third, perfect fifth, major seventh, and major ninth.
The A# Major 9th piano chord (A#maj9) consists of the notes A#, D, F, A, C. It is a major 7th chord with an added major 9th, giving it a lush, sophisticated character often used in jazz, R&B, and neo-soul progressions. Formula: R-M3-P5-M7-M9 | Scale degrees: 1-3-5-7-9.
Notes
Key Signature
The key of A# Major 9th (enharmonically equivalent to Bb Major 9th) 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♯ Major 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♯ Major 9th — Frequently Asked Questions
What notes are in the A# Major 9th chord?
A# Major 9th is built from the A# root. Check the interactive keyboard above for exact notes and fingering.
How is the A# Major 9th chord used in music?
A# Major 9th appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Major 9th).
What is the fingering for A# Major 9th?
See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.
What are the inversions of A# Major 9th?
Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.
Practice Tips
- Rich, extended jazz voicing.
- The 9th adds colour and depth.
- Practice dropping less essential notes.
- Compare with the simpler 7th version.
- Jazz, R&B, neo-soul applications.
- Spread voicings sound best.
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.