Half-Diminished Chords (m7b5) - Drop 2 and Drop 3 Voicings - Guitar Diagrams and Theory
What's a Half-Diminished Chord?
Half-diminished chords are built with:
- Root (1)
- minor third (b3)
- Diminished fifth (b5)
- 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 see in the chart below the comparison between a diminished triad and half diminished chord formula. A half-diminished chord is actually a diminished triad with a b7.
|B Diminished triad||B||D||F||X|
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.
Diminished 7th and half-diminished chords are both based on a diminished triad (1 b3 b5). The difference is in the seventh. Dim7 chords contain a diminished seventh (bb7) whereas m7b5 chords have a minor seventh (b7).
|Half-diminished 7th chord||1||b3||b5||b7|
|Diminished 7th chord||1||b3||b5||bb7|
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 closed chord to the bass. half diminished closed chord formula is 1-b3-b5-b7 that gives the following drop 2 chord formula b5-1-b3-b7.
What Are Inverted Voicings?
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 below, 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.
|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|
How To Play Drop 2 m7b5 Chords on Guitar?
The three neck diagrams show how drop 2 half-diminished voicings are inter-connected. Each chord position is assigned its own specific colour.
The root position is represented by the black dots, the first inversion is in blue, the second is in red and the third is in green.
These shapes can be placed anywhere on the guitar fretboard. Whichever fret we choose to play the root on determines the chord.
What Are Drop 3 Voicings,
Drop 3 voicings are widely used in jazz and most popular as drop 2 voicings, they are ideal for solo guitar playing such as chord melody. Drop 3 chords are made by dropping the third highest note of a closed position. For example, a Bm7b5 closed voicing is B (root), D (minor third), F (diminished fifth) and A (minor seventh).
By dropping the third highest note (F) an octave down, we get a new voicing : b3, R, b5, b7 corresponding to the first inversion of the root position (the one with the root in the bass). Like the previous drop 2 voicings there are four different drop 3 voicings to play a half diminished chord.
|Root position (drop 3)||R||b7||b3||b5|
|1st inversion (minor third in the bass)||b3||R||b5||b7|
|2nd inversion (fifth in the bass)||b5||b3||b7||R|
|3rd inversion (seventh in the bass)||b7||b5||R||b3|
Three Rules You Need to Know About Drop 3 Chords :
- The lowest notes are always on the 5th of 6 strings.
- There is a string skip in every shapes.
- Unlike drop 2 chords, there are no drop 3 chord shapes with bass on the 4th string.
Many guitar students wonder what scale to use over minor seventh flat five chords. It is necessary to have a good understanding on how to improvise over half-diminished chords. Most of the time m7b5 chords are used as the ii of a minor ii-V-I chord sequence.
The Locrian Mode
The most obvious choice is to play the Locrian scale, seventh mode of the major scale also considered as the second mode of the natural minor scale. The Locrian mode is spelled 1-b2-b3-4-b5-b6-b7. By taking the root (1), the minor third (b3), the diminished fifth (b5) and the minor seventh (b7) of the Locrian scale you get the notes of the half-diminished chord.
|Formula||1||b2 (b9)||b3||4 (11)||b5||b6 (b13)||b7|
The Locrian 13 or Locrian 6 Mode
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|
The Locrian #2 Mode
The Locrian #2 mode is another interesting option if you want to bring a different sound to your improvisations. Indeed, the Locrian #2 as a major ninth which sounds modern. It is the sixth mode of the melodic minor scale, the formula is 1-2-b3-4-b5-b6-b7.
|Formula||1||2 (9)||b3||4 (11)||b5||b6 (b13)||b7|
The Locrian Bebop Scale
The Locrian bebop scale contain the same notes 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|
This pdf method for guitar contains 40 II V I jazz guitar lines with tab, standard notation, analysis, scale charts and audio files.
This guitar method is a printable PDF eBook containing 50 exercises with audio files, analysis, tab & standard notation.
This PDF method contains 40 exercices with tabs, scores and audio files for practicing jazz guitar chords over the minor 2 5 1 progression.
This guitar method is a printable PDF with tabs, diagrams, theory and audio files providing 40 minor II V I jazz licks.
This package contains 3 PDF methods for jazz guitarists with tabs, audio files, analysis about the II V I progression.
This package contains a guitar method available as a PDF with tabs, audio files and theory providing 40 dominant jazz guitar lines for teachers and students.
This printable guitar method in PDF format contains 40 easy minor jazz guitar lines based on the Dorian mode.
Printable PDF eBook method containing 40 major jazz guitar licks with tab, standard notation and audio files for beginners and intermediates.
This package contains 120 jazz guitar lines based on diatonic modes as Mixolydian, Dorian and Ionian. PDF format with tabs, audio files and analysis.
This jazz guitar method about walking bass lines and chords is available as a PDF files containing 35 exercises with tabs, analysis and audio files
This printable PDF method provides 101 dominant arpeggio exercises with tab, theory and standard notation for the jazz, blues and rock guitarist.
This printable eBook method in PDF format provides 49 jazz solo transcriptions of the greatest jazz musicians of all times with TABS, standard notation, audio files and analysis both for guitar teachers and students.
This PDF method contains 11 guitar lessons with chord studies, tabs, standard notation, analysis & audio files about the main blues progressions used in jazz music.
This PDF eBook method contains 25 altered jazz guitar licks with tabs, patterns, scale charts and audio files to master, apply and develop the altered scale.
This printable method is available as a PDF file containing 40 easy dominant jazz-blues guitar lines with tabs, standard notation, analysis, audio files and scale charts.
This jazz guitar method is an eBook available as a PDF with standard notation, guitar tabs, diagrams, analysis, audio files and backing tracks. You will find in this booklet 25 easy jazz guitar lines with theory using common and rare pentatonic scales.
You will find here an eBook available in PDF containing 25 soul jazz and hard bop guitar licks in the style of Grant Green, Melvin Sparks, George Benson. These jazz lines come with tabs, standard notation, guitar neck diagrams, backing track for practice and 25 audio files for each riff.
This eBook PDF with audio files contains 25 dominant diminished jazz guitar patterns using the half-whole diminished scale and diminished 7th arpeggios.
This Printable PDF eBook available for free download contains 6 easy jazz guitar licks with tabs/notation, youtube video link and analysis about the tritone substitution.
Last edited: 11/01/2020