m7b5 (m7-5) chords
The Minor 7th flat 5th
Chord is an alternation of the minor seventh chord, and is also called Half-diminished or Minor 7th minus 5th. This chord is a minor seventh except that the fifth are lowered one step.
By comparing Cm7 with Cm7b5 we could see that the notes changes from C, Eb, G, Bb to C, Eb, Gb, Bb.
The easiest way to play these chords are by the movable shape presented in the diagrams below (Am7b5 is partly an exception, with two open strings).
Minor 7th flat 5th
Am7b5 could of course also be played as x 12 13 12 13 x.
The minor seventh flat fifth is built with the formula 1-b3-b5-b7. This include the root (1), the minor third (b3), a lowered fifth (b5) and the minor seventh.
Chord constructionCm7b5 x - x - C - Gb - Bb - Eb
C#m7b5 x - x - C# - G - B - E
Dm7b5 x - x - D - Ab - C - F
D#m7b5 x - x - D# - A - Db - Gb
Em7b5 x - x - E - Bb - D - G
Fm7b5 x - x - F - B - Eb - Ab
F#m7b5 x - x - F# - C - E - A
Gm7b5 x - x - G - Db - F - Bb
G#m7b5 x - x - G# - D - Gb - B
Am7b5 x - x - A - Eb - G - C
A#m7b5 x - x - A# - E - Ab - Db
Bm7b5 x - x - B - F - A - D
Guitar versions of the chord
Notes in chordCm7b5 C - Eb - Gb - Bb
C#m7b5 C# - E - G - B
Dm7b5 D - F - Ab - C
D#m7b5 D# - F# - A - C#
Em7b5 E - G - Bb - D
Fm7b5 F - Ab - B - Eb
F#m7b5 F# - A - C - E
Gm7b5 G - Bb - Db - F
G#m7b5 G# - B - D - F#
Am7b5 A - C - Eb - G
A#m7b5 A# - C# - E - G#
Bm7b5 B - D - F - A
The intervals are 1 – 3b – 5b – b7
How and when to use half-diminished chords
These chords are, for example, used as an in-between chord. It can be used both in its own key or in other keys which its tones partly match.
It could substitute 7th or 9th chords, for example, and especially the V chord. An example in which Em7b5 substitute the V chord:
Gmaj7 - Bm7 - Em7 - Em7b5 - Am7
Progressions including this chord type:
Am7 - Bm7b5 - E7
Am7 - Abm7b5 - G7
Dm7 - Dm7b5 - G7 - Cmaj7
C7 - Em7b5 - A7 - Dm7 - G7
Minor seventh flat fifth is often used as in between chord in blues and jazz progressions.
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