Chord
B♭m7♭5 is a half-diminished seventh chord with the notes B♭, D♭, F♭, A♭. Also written B♭ø, B♭–7♭5. The same chord spelled from A♯ is A♯m7♭5.
| Note | Interval | Semitones |
|---|---|---|
| B♭ | root | 0 |
| D♭ | minor 3rd | 3 |
| F♭ | diminished 5th | 6 |
| A♭ | minor 7th | 10 |
| Root position | B♭ – D♭ – F♭ – A♭ | |
| 1st inversion | D♭ – F♭ – A♭ – B♭ (B♭m7♭5/D♭) | |
| 2nd inversion | F♭ – A♭ – B♭ – D♭ (B♭m7♭5/F♭) | |
| 3rd inversion | A♭ – B♭ – D♭ – F♭ (B♭m7♭5/A♭) |
A half-diminished chord (m7♭5) is a diminished triad with a minor 7th added. It is the vii chord of major keys and the ii chord of minor keys, as in the minor ii–V–i.
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