Half diminished chords - m7b5 - Guitar positions, diagrams and inversions

Half diminished chords

Half diminished chords are built with a root (1), a minor third (b3), a diminished fifth (b5) and a minor seventh (b7). They are also known as minor seventh flat five chords (m7b5), because they are minor seventh chords with the fifth lowered by a 1/2 step. You can also consider it as a diminished chord whose seventh is raised by a semi-tone.

You can see in the chart below the comparison between a diminished triad and half diminished chord formula. A m7b5 chord is built by stacking 3 minor and one major third intervals.

Formula 1 3 5 b7
B Diminished triad B D G X
Bm7b5 chord  B D G A

 

Half diminished chord notation and symbols

In a chart, half diminished chords may be found written in several ways : Cm7(b5), Cm7b5, Cmin7b5 or CØ. The last one should not be confused with the diminished notation that is a circle without a bar through it. 

Drop 2 Half diminished chord voicings

What are drop 2 chords ?

Drop 2 chords are the most popular chord voicings used in jazz guitar. They are built by dropping the second highest note of a four-notes close chord to the bass. half diminished close chord formula is 1-b3-b5-b7 that gives the following drop 2 chord formula b5-1-b3-b7. 

Inverted chord ?

The root of an inverted chord is not in the bass. It means that the notes of a chord are inverted. As you can see in the guitar diagrams above, there can be a third, a fifth or a seventh in the bass. 

The chart below contains four drop 2 half diminished voicings. You can see a root chord and three related inverted chords. The root chord has its root (R) in the bass and the inverted chords have the b3, b5 and b7 in the bass. This is the principle of the inversion, the chord tones are played in a different order.

Root chord  1 b5 b7 b3
1st inversion (minor third in the bass) b3 b7 R b5
2nd inversion (fifth in the bass) b5 R b3 b7
3rd inversion (seventh in the bass) b7 b3 b5 R

 

These shapes below can be placed anywhere on the guitar fretboard. Whichever fret we choose to play the root on determines the chord. If you place the first chord so that the root is on the third fret, the chord will be Gm7b5. 

Drop 2 m7b5 7 chords | Root position and inversions | Bass on 6th string

Root position # 1 

Half diminished guitar chord diagram 6 drop 2

Inverted position # 1 

Half diminished guitar chord diagram 6 drop 2 (2)

Inverted position # 2

Half diminished guitar chord diagram 6 drop 2 (3)

Inverted position # 3

Half diminished guitar chord diagram 6 drop 2 (4)

Drop 2 m7b5 7 chords | Root position and inversions | Bass on 5th string

Root position # 2 

m7b5 chord guitar diagram 5

Inverted position # 1 

m7b5 chord guitar diagram 5 2

Inverted position # 2

m7b5 chord guitar diagram 5 3

Inverted position # 3

m7b5 chord guitar diagram 5 4

Drop 2 m7b5 7 chords | Root position and inversions | Bass on 4th string

Root position # 3

m7b5 chord guitar diagram 4

Inverted position # 1 

m7b5 chord guitar diagram 4 2

Inverted position # 2

m7b5 chord guitar diagram 4 3

Inverted position # 3

m7b5 chord guitar diagram 4 4

Related half diminished scales and modes

Here are the main scales to play over half diminished chords.

The locrian mode : This is the seventh mode of the major scale.

Formula 1 b2 (b9) b3 4 (11) b5 b6 (b13) b7
Intervals H W W H W W W

 

The locrian 13 or locrian 6 : This is the second mode of the harmonic minor scale. In comparison with the locrian mode, it has a major sixth instead of a minor sixth.

Formula 1 b2 (b9) b3 4 (11) b5 6 (13) b7
Intervals H W W H W+H H W

 

The locrian #2 mode : This is the sixth mode of the melodic minor scale. 

Formula 1 2 (9) b3 4 (11) b5 b6 (b13) b7
Intervals W H W H W W W

 

The locrian bebop scale : This is the same as the locrian mode including an additional fifth between the flat fifth (b5) and the minor sixth (b6).

Formula 1 b2 (b9) b3 4 (11) b5 5 b6 (b13) b7
Intervals H W W H H H W W

 

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Last edited: 06/03/2017

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