B♭ minor 7th flat 5th chord on ukulele (B♭m7♭5)

Why it sounds like that

B♭ minor 7th flat 5th stacks a minor 3rd, a diminished 5th, and a minor 7th over its root. The diminished 5th between B♭ and F♭ creates the chord's tense quality. Compare it to B♭ minor 7th, which raises the ♭5 to a perfect 5th.

What goes wrong with B♭ minor 7th flat 5th?

• Letting the ring finger flatten onto the A string and choke its note.
• Allowing the middle finger to touch the open E string, dulling its sound.
• Pressing too hard with the index finger, which can pull the G string sharp.

When to use it

B♭ minor 7th flat 5th functions as the ii chord in A♭ natural minor, often leading to E♭ or A♭ minor. Its tense sound suits jazz ballads and bluesy passages. Try it before B♭ minor in a minor-key vamp.

Changing to and from B♭ minor 7th flat 5th

• Sliding the shape down two frets to the 1st fret gives A♭ minor 7th flat 5th.
• Move to B♭ minor 7th by lifting the middle finger and placing it on the 2nd fret of the C string.

Which voicing to use

The 1st-fret voicing puts D♭ in the bass, giving a darker, less stable sound. The 9th-fret shape has B♭ in the bass and sits higher, cutting through a mix. Choose the 3rd-fret F♭ inversion when you need a mid-range voice leading.