Chords and Arpeggios From the Locrian Mode
The Locrian mode produces a diminished triad and a half-diminished arpeggio. Diminished triads consist of root (1) and minor third (b3) and a diminished fifth (b5).
Add the minor seventh (b7) and you get a half-diminished chord (tetrad). Half-diminished arpeggios are made up of a root, minor third, diminished fifth and minor seventh (b7).
| B Locrian mode |
B |
C |
D |
E |
F |
G |
A |
Chord |
| Formula |
1 |
b2 (b9) |
b3 |
4 (11) |
b5 |
b6 (b13) |
b7 |
|
| B diminished triad |
1 |
x |
b3 |
x |
b5 |
x |
x |
Bmb5 |
| B half-diminished 7 tetrad |
1 |
x |
b3 |
x |
b5 |
x |
b7 |
Bm7b5 |
| B half-diminished arpeggio |
1 |
x |
b3 |
x |
b5 |
x |
b7 |
|
Locrian Mode Basic Application
The Locrian mode is basically used over half-diminished chords (m7b5) however, these chors are rarely employed. So, you have to know that a half-diminished arpeggios can be used to highlight the ninth (9) of a dominant 7th chord.
For example, you can play a E half-diminished arpeggio (E-G-Bb-D) over a C dominant seventh chord (C7) starting from its third.
| E half diminished arpeggio |
E |
G |
Bb |
D |
| C dominant 7th chord |
C |
E |
G |
Bb |
- E of E half diminished arpeggio is the third of C7
- G is the fifth
- Bb is the minor seventh
- D is the ninth.
Another common jazz trick is to apply a half diminished arpeggio to a minor seventh chord starting on the third of this chord. This technique allows to highlight the thirteenth of a minor chord.
For example, let's take a D minor seventh (Dm7) chord built with D, F, A and C respectively root (1), minor third (b3), perfect fifth (5) and minor seventh (b7). The sixth of D is B which can also be named thirteenth (13). So now you just have to play a B half diminished arpeggio, which is B, D, F and A.
| B half diminished arpeggio |
B |
D |
F |
A |
| D minor seventh chord |
D |
F |
A |
C |
Matching notes
- B is the thirteenth of Dm
- D is the root
- F is the third
- A is the fifth