A♯ Half Diminished
Also Known As
Hear the A♯ Half Diminished chord played for you.
A♯ø7
A♯ – C♯ – E – G♯
Formula:R-m3-d5-m7
Intervals:P1-m3-d5-m7
Scale Degrees:1-b3-b5-b7
Introduction
The A♯ Half Diminished chord is a four-note chord made up of A♯, C♯, E, and G♯. It is built from a root, minor third, diminished fifth, and minor seventh.
The A# Half Diminished piano chord (A#m7b5) consists of the notes A#, C#, E, G#. It is a diminished triad with an added minor 7th, giving it a dark, moody, and tense character commonly used in jazz and minor key progressions. Formula: R-m3-d5-m7 | Scale degrees: 1-b3-b5-b7.
Notes
A♯ Half Diminished Inversions
| Position | Notes |
|---|---|
| Root Position | A♯ – C♯ – E – G♯ |
| 1st Inversion | C♯ – E – G♯ – A♯ |
| 2nd Inversion | E – G♯ – A♯ – C♯ |
| 3rd Inversion | A♯ – C♯ – E – G♯ |
Key Signature
The key of A# Half Diminished (enharmonically equivalent to Bb Half Diminished) 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-d5-m7
Intervals: P1-m3-d5-m7
The A♯ Half Diminished is built by stacking intervals from the root note. The formula R-m3-d5-m7 describes the scale degrees used. The intervals P1-m3-d5-m7 show the distance between each note in the chord.
A♯ Half Diminished — Frequently Asked Questions
What notes are in the A# Half Diminished chord?
A# Half Diminished is built from the A# root. Check the interactive keyboard above for exact notes and fingering.
How is the A# Half Diminished chord used in music?
A# Half Diminished appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Half Diminished).
What is the fingering for A# Half Diminished?
See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.
What are the inversions of A# Half Diminished?
Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.
What is the ii-V-i progression with A# Half Diminished?
A# Half Diminished functions as the ii chord in minor-key jazz harmony, resolving through the V7 to the minor tonic.
Practice Tips
- Minor-key ii–V–i is essential jazz vocabulary.
- Compare with A#dim7 and A#m7.
- The flatted fifth creates the half-diminished tension.
- Essential for jazz minor keys.
- The ø symbol means half-diminished.
- Practice in context of minor-key progressions.
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.