Bbm7b5 chord on guitar

The Bb half diminished chord, written Bbm7b5, has 4 notes: Bb Db Fb Ab. The root Bb is also written A#, so A#m7b5 is the same chord.

As tab, thick low E string first: x12120, x12124, 678999. Numbers in the dots are fingers: 1 index, 2 middle, 3 ring, 4 little, T thumb. × marks a muted string and ○ an open one.

About the Half Diminished Chord

A half diminished chord is a diminished triad with a flat seventh, the ii chord of a minor key. More about the Half Diminished Chord.

Keys with Bbm7b5

These keys have Bbm7b5 among their chords:

• B Major Scale (vii°)
• G# Natural Minor scale (ii°)

Scales to play over Bbm7b5

Each of these scales holds every note of the chord:

• Bb Locrian Mode
• Bb Blues Scale

Half Diminished Chord in other keys

• Cm7b5
• C#m7b5
• Dm7b5
• Ebm7b5
• Em7b5
• Fm7b5
• F#m7b5
• Gm7b5
• G#m7b5
• Am7b5
• Bm7b5