The 7th is lowered twice for a Fully-Diminished chord, but only once for a Half-Diminished chord. The Fully-Diminished chord also differs from the Half-Diminished chord by one note: 1, b3, b5, bb7. This chord can be represented by the following nomenclature:
The Half-Diminished (or Minor 7(b5) chord is represented by two different symbols that mean exactly the same thing. The only pitch that is different between a minor 7th chord and a half-diminished chord is the 5th, which becomes a b5 for the Half-Diminished chord. It is important to realize that a min7(b5) chord has three of it’s four notes in common with a minor 7th chord.
What is a Half-Diminshed Chord?Ī Half-Diminished chord is a Minor 7th chord with a flat 5th. Take heart as you will see, improvising over a half-diminished chord isn’t all that different from improvising over a minor chord. I think the reason that half-diminished chords seem so mysterious to some improvisers is because they are less common than major, minor, and dominant chords, and so we have fewer opportunities to practice them in context. The Half-Diminished chord is made up of the chord tones 1, b3, b5, and b7. The half-diminished, or minor 7(b5) chord, is a pretty common chord, but it’s not as common as major 7th, minor 7th, or dominant 7th chords. I was recently asked if I could I do a post on the mysterious Half-Diminished chord (check out our Half-Diminished chord workouts) so here is a basic guide to improvising over this widely misunderstood chord symbol, including some scale choices and example licks.
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