B♭m7♭5
Half-dim · B♭ – D♭ – F♭ – A♭
- B♭R
- D♭m3
- F♭♭5
- A♭♭7
Guitar voicings
Piano
- Root
- Third / sus
- Fifth
- Sixth / seventh
- Extension
About the B♭m7♭5 chord
The B♭m7♭5 chord (Half-dim) is built from B♭ (the root), D♭ (a minor third), F♭ (a diminished fifth) and A♭ (a minor seventh). Half-diminished chords are moody and jazzy — most often the ii chord in a minor key.