Quick Answer & Harmonic Definition

To play the A# Half-Diminished 7th chord on piano, press the keys A#, C#, E, G# simultaneously. In root position, A# is the lowest note. First inversion places C# in the bass; second inversion uses E as the lowest note.

Piano Chord

A#m7b5 Piano Chord

Diminished triad with a minor seventh. Common in jazz as the ii chord in minor keys. Learn the A# Half-Diminished 7th chord on piano with interactive keyboard, inversions, and audio playback.

Notes
A# – C# – E – G#
Intervals
0 – 3 – 6 – 10
Type
seventh chord
A# C# E G#
E
A
D
G
B
e
3
5
7
9
12
4 notes · Standard (E A D G B E)

Playing the A#m7b5 Piano Chord

The A#m7b5 chord is a half-diminished 7th chord built on the root A#. It contains 4 notes: A#, C#, E, G#. On piano, this chord is played by pressing these keys simultaneously or as an arpeggio.

Diminished triad with a minor seventh. Common in jazz as the ii chord in minor keys. Mastering the A#m7b5 chord opens up countless songs and progressions in the key of A#.

Piano Finger Positions for A#m7b5

For the A#m7b5 seventh chord, use these finger positions:

  • Right hand (root position): Thumb (1) on A#, middle finger (3) on C#, pinky (5) on E.
  • Left hand (root position): Pinky (5) on A#, middle finger (3) on C#, thumb (1) on E.
  • Arpeggiated: Play the notes sequentially from lowest to highest for a broken seventh effect.

A#m7b5 Chord Inversions

Inversions change the bass note while keeping the same harmonic quality:

Inversion Bass Note Notes (bottom to top) Sound
Root A# A# – C# – E – G# Most stable
1st C# C# – E – G# – A# Lighter, less stable
2nd E E – G# – A# – C# Open, airy

Interval Structure of A#m7b5

Degree Interval Semitones Note in A#
Root Root (R) 0 A#
3rd Minor 3rd 3 C#
5th Tritone 6 E
7th Minor 7th 10 G#

Common Progressions with A#m7b5 on Piano

  • I–IV–V–I: A#m7b5 – D#m7b5 – Fm7b5 – A#m7b5 (classic cadence)
  • I–V–vi–IV: A#m7b5 – F – Gm – D# (pop progression)
  • ii–V–I: Cm – F – A#m7b5 (jazz turnaround)

Other A# Piano Chords

A#
Major
A#m
Minor
A#7
Dominant 7th
A#maj7
Major 7th
A#m7
Minor 7th
A#dim
Diminished

Half-Diminished 7th Chord in All 12 Keys

Cm7b5 C#m7b5 Dm7b5 D#m7b5 Em7b5 Fm7b5 F#m7b5 Gm7b5 G#m7b5 Am7b5 A#m7b5 Bm7b5
Virtual Piano
Interactive keyboard
A#m7b5 Guitar
Guitar chord shapes
A# Scale
Notes that fit this chord
Songs
Find songs using A#m7b5

Knowledge Base & FAQs

A#m7b5 Piano Chord — FAQ

Everything you need to know about our browser-based Web Audio engine, instruments, and music theory workspace.

How do I play the A#m7b5 chord on piano?

To play the A# Half-Diminished 7th chord on piano, press the keys A#, C#, E, G# simultaneously.

In root position, A# is the lowest note. First inversion places C# in the bass; second inversion uses E as the lowest note.

What are the notes in the A#m7b5 piano chord?

The A# Half-Diminished 7th piano chord contains 4 notes: A#, C#, E, G#.

These are derived from the half-diminished 7th interval formula applied to the root note A#.

What is the best fingering for A#m7b5 on piano?

For the A#m7b5 seventh in root position, use fingers 1 (thumb), 3, and 5 for a triad, or 1, 2, 3, and 5 for a seventh chord.

Inversions may use 1, 2, 4 (first inversion) or 1, 3, 5 (second inversion).

What does the A#m7b5 chord sound like?

The A#m7b5 chord has a diminished triad with a minor seventh.

common in jazz as the ii chord in minor keys. It provides rich harmonic tension and expressive color within songwriting and jazz arrangements.

What keys does the A#m7b5 chord belong to?

A#m7b5 appears frequently across modal, jazz, blues, and contemporary progressions as an essential tension or resolution voicing.

What are the inversions of A#m7b5 on piano?

A#m7b5 has 3 inversions.

Root position: A#–C#–E–G#. First inversion: C#–E–G#–A#. Second inversion: E–G#–A#–C#.

What chords go well with A#m7b5 on piano?

In the key of A# major, A#m7b5 pairs naturally with D# major (IV chord), F major (V chord), and Gm (vi chord).

The I–IV–V–I progression is a classic way to practice these.

Is A#m7b5 a good chord for beginners on piano?

A#m7b5 has 4 notes, which may be challenging for beginners.

Start with the basic triad (root, third, fifth) before adding the full seventh extension.

How do I use A#m7b5 in a chord progression?

A#m7b5 functions as the tonic (I) in A# major.

A classic progression is I–IV–V–I: A#m7b5–D#–F–A#m7b5. Practice this in both hands separately before combining.

What is the difference between A# major and A# minor on piano?

The A# major chord (A#–D–F) uses a major third (4 semitones from root) for a bright sound.

The A#m chord uses a minor third (3 semitones) for a darker, more emotional sound.