A♯ / B♭ Half-Diminished 7th
A#m7♭5
Minor 7th with a flat 5. Used in jazz ii-V-I in minor keys.
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Piano Keyboard
Guitar Fretboard
Intervals
| Interval | Semitones | Note |
|---|---|---|
| R | 0 | A♯ / B♭ |
| m3 | 3 | C♯ / D♭ |
| TT | 6 | E |
| m7 | 10 | G♯ / A♭ |
A#m7♭5
Minor 7th with a flat 5. Used in jazz ii-V-I in minor keys.
| Interval | Semitones | Note |
|---|---|---|
| R | 0 | A♯ / B♭ |
| m3 | 3 | C♯ / D♭ |
| TT | 6 | E |
| m7 | 10 | G♯ / A♭ |