B♭m7♭5
B♭ half-diminished seventh
Notes
B♭ – D♭ – F♭ – A♭
Formula
1 – ♭3 – ♭5 – ♭7
A diminished triad with a minor seventh.
To build B♭m7♭5, start on B♭ and stack the intervals ♭3, ♭5, ♭7 above it.
On piano
On guitar
We don't have a verified, comfortable guitar shape for this chord yet, so we're not showing one.