Formula and Structure of the A#m7b5 Chord
Interval formula from the root note: 1 — b3 — b5 — b7. The chord consists of the following notes:
- Bb — unison and the main tonal anchor.
- Db — minor third with a melancholic character and gentle lyricism.
- E — diminished fifth with tritone tension, best used cautiously in the bass.
- Ab — minor seventh with dominant pull toward the tonic.
Together, these notes form the harmonic foundation of the A#m7b5 chord, defining its sound and role in the musical context.
Alternative Names for the A#m7b5 Chord
This chord may appear under different names:
- A#ø7
- A#ø
All variants refer to the same harmonic structure.
Using the A#m7b5 Chord
Place the b5 above the bass to soften the character. Add the 9 or 11 for extension, spacing them apart from the b3 and b7. Fits well in minor II–V–I and jazz ballads.
Conclusion
A#m7b5 is an expressive and versatile chord. Learn several fingerings, experiment with different positions and voice spacing, then try weaving it into your own playing — this will help you quickly find your unique tone.
