Minor ii–V–i
in G♯ minor
Piano chord · also written B♭m7♭5
A♯ Half-Diminished 7th Piano Chord (A♯m7♭5)
The A♯ Half-Diminished 7th chord on piano is made of the notes A♯, C♯, E and G♯. Bittersweet tension. Used as the ii chord in minor keys.
Tap any key to hear it.
What notes are in A♯ Half-Diminished 7th?
4 notes, built 1 – ♭3 – ♭5 – ♭7 up from A♯.
- Notes
- A♯ – C♯ – E – G♯
- Formula
- 1 – ♭3 – ♭5 – ♭7
- Semitones from the root
- 0 – 3 – 6 – 10
- Symbol
- A♯m7♭5
- Same keys as
- B♭m7♭5 (B♭ – D♭ – F♭ – A♭)
- Chord type
- Half-Diminished 7th, 4 notes
How to play A♯ Half-Diminished 7th on piano
- Right hand: A♯ (1), C♯ (2), E (3), G♯ (5). Fingers 1 – 2 – 3 – 5, thumb on A♯.
- Left hand: A♯ (5), C♯ (3), E (2), G♯ (1). Fingers 5 – 3 – 2 – 1, little finger on A♯.
Fingers are numbered 1 (thumb) to 5 (little finger) on both hands.
A♯ Half-Diminished 7th inversions
Each inversion puts a different note of the chord in the bass. Written as a slash chord: A♯m7♭5/C♯, A♯m7♭5/E, A♯m7♭5/G♯.
Can you find A♯ Half-Diminished 7th?
Tap the notes on the keyboard, then check. Six chords, starting with this one.
1 / 6 Tap the notes of A♯ Half-Diminished 7th (A♯m7♭5)
Score 0
Any octave, any order. Each key you tap plays.
What key is A♯ Half-Diminished 7th in?
The keys whose scale contains every note of A♯m7♭5, with the chord’s Roman numeral in each.
Major keys
- B majorviiø7
Minor keys
- G♯ minoriiø7
A♯ Half-Diminished 7th chord FAQ
What notes are in the A♯ Half-Diminished 7th chord?
A♯ Half-Diminished 7th (A♯m7♭5) has 4 notes: A♯, C♯, E and G♯. Its formula is 1 – ♭3 – ♭5 – ♭7, counted up from A♯.
How do you play A♯ Half-Diminished 7th on the piano?
Put your right thumb on A♯ and play A♯, C♯, E and G♯ with fingers 1 – 2 – 3 – 5. With the left hand, use fingers 5 – 3 – 2 – 1, little finger on A♯.
Is A♯ Half-Diminished 7th the same as B♭ Half-Diminished 7th?
On the piano, yes: B♭m7♭5 (B♭, D♭, F♭, A♭) uses exactly the same keys as A♯m7♭5 (A♯, C♯, E, G♯). Which name is used depends on the key of the piece; A♯m7♭5 is the more common spelling.
What are the inversions of A♯ Half-Diminished 7th?
1st inversion: C♯, E, G♯, A♯ (A♯m7♭5/C♯). 2nd inversion: E, G♯, A♯, C♯ (A♯m7♭5/E). 3rd inversion: G♯, A♯, C♯, E (A♯m7♭5/G♯).
What key is A♯ Half-Diminished 7th in?
A♯m7♭5 belongs to B major (viiø7) and G♯ minor (iiø7).