Bbm7b5 chord

The Bbm7b5 chord (Bb half-diminished, also written A#m7b5) on a piano: the notes, every inversion and the keys it belongs to. Tap play to hear it, and download it as MIDI.

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Bb1Dbb3Fb= Eb5Abb7

About the half-diminished chord

A diminished chord with a minor seventh, also written ø. The natural chord on the second step of a minor key.

Formula: 1 b3 b5 b7. Used in: Jazz and minor-key ii-V-i progressions, R&B.

Bbm7b5 inversions

Tap an inversion to hear it. Inversions keep the same notes in a different order, which lets chords move smoothly from one to the next.

Keys with Bbm7b5

Bbm7b5 is the VII chord in B major and II chord in G# minor.

It also appears in C# Dorian (VI), D# Phrygian (V), E Lydian (IV), F# Mixolydian (III).

Build a progression around it in the chord progression generator.

More Bb chords

Other half-diminished chords

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Questions

What notes are in a Bbm7b5 chord?

Bb, Db, Fb (E), Ab.

What is the formula of a half-diminished chord?

1 b3 b5 b7. A diminished chord with a minor seventh, also written ø. The natural chord on the second step of a minor key.

What key is Bbm7b5 in?

Bbm7b5 is a chord in B major (VII), G# minor (II).

Is Bbm7b5 the same as A#m7b5?

Yes. Bb and A# are the same key on the piano, so the chords sound the same. Which name is used depends on the key of the song.