Drop 2 diminished seventh chords (Dim7) - Jazz guitar diagrams
Diminished seventh chords (dim7) are made up of a root (1), a minor third (b3), a diminished fifth (b5) and a diminished seventh (bb7). Therefore, they are built with a diminished triad (1-b3-b5) and a diminished seventh interval (bb7). In other words, you simply have to stack four minor thirds (three semitones) to built diminished 7th chords.
Dim7 chords are symmetrical, they are based on an equal division of the octave into four minor third intervals. That means there are four different diminished chords in one position. For example, C diminished 7th chord contains these four notes : C, Eb, Gb and A. Each note is separated by three semitones (minor thirds). Because a dim7 chord is made up of four minor third intervals, so there are three other diminished seventh chords in the Cdim7 chord : Ebdim7, Ebdim7 and Adim7.
Diminished 7th chord are often used to replace (chord substitution technique) dominant seventh flat ninth chords (7b9). Example in a C major II-V-I progression :
Dm7 | G7 | CM7 becomes Dm7 | Bdim7 | CM7 | Because of the symmetry of the diminished 7th chord there are three other possibilities Dm7 | Ddim7 | CM7 | or Dm7 | Fdim7 | CM7 or Dm7 | Abdim7 | CM7.
You can even try to replace the dominant 7th chord in a common I | VI | II | V turnaround sequence. Example in the key of C major : CM7 | A7 | Dm7 | G7 | becomes CM7 | Dbdim7 | Dm7 | Bdim7 |. Feel free to explore all the possible progressions using the symmetry technique.
Drop 2 diminished 7th chord voicings
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. Diminished seventh close chord formula is 1-b3-b5-bb7 that gives the following drop 2 chord formula b5-1-b3-bb7.
Inverted chord ?
It means that the notes of a chord are inverted. The root of an inverted chord is not in the bass. As you can see in the guitar diagrams above, there can be a third, a fifth or a seventh in the bass.
Here is a chart that contains four drop 2 diminished 7th voicings. You can see a root chord voicing and its three related inverted voicings. 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||bb7||R||b5|
|2nd inversion (diminished fifth in the bass)||b5||R||b3||bb7|
|3rd inversion (diminished seventh in the bass)||bb7||b3||b5||R|
Drop 2 Diminished 7th chords | Root position and inversions | Bass on 6th string
Drop 2 Diminished 7th chords | Root position and inversions | Bass on 5th string
Drop 2 Diminished 7th chords | Root position and inversions | Bass on 4th string
Related diminished scales
Here are the three diminished scales related to dim7 chords.
The whole half diminished scale. This is a an eight note scale that consists of a repeating pattern of whole steps and half steps.
|C whole half diminished scale||C||D||Eb||F||Gb||Ab||A||B|
|Formula||1||9 (2)||b3||11 (4)||b5||#5||13 (6)||7|
The half whole diminished scale . This is a an eight note scale too, that consists of a repeating pattern of halfs steps and whole steps. It is the opposite of the previous diminished scale.
|C half whole diminished scale||C||Db||Eb||E||F#||G||A||Bb|
|Formula||1||b9||#9||3||#11 or b5||5||13 (6)||b7|
Super Locrian bb7 scale. This is the seventh mode of the harmonic minor scale.
|B super locrian bb7 mode||B||C||D||Eb||F||G||Ab|
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Last edited: 16/04/2017