|
Chords on the Modes
Ionian – this is the familiar mode. Use the chord boxes developed from the circle of 5ths to choose chords.
Dorian Mode - Refer to the circle of 5ths to generate chord boxes. Now the tonal center shifts to a different tone and that changes the relationships among the chords.
For example, here’s what happens when we play in the Dorian mode of the key of D. Think of part A of Star of the County Down as you work through this.
The Chord Box for D Dorian is:
G D A
Em Bm F#m
D is the tonic chord in this chord box.
But the Dorian scale uses E as it’s starting point – re me fa so la ti do. So the tone E must become the central focus of the chord box. So, in D - Dorian mode Em is the tonic chord. This shifts the center of the chord box into the relative minor and over to the relative minor of the key of G
C G D
Am Em Bm
Em is the tonic chordin this chord box.
The chord relations change because the tonic chord has changed. Now Am and Bm have strong relationships with the tonic Em. The D tone becomes the subtonic degree of the scale and the D chord plays the role a V chord does in the Ionian mode.
Dorian Chord relationships are established for the keys of G and A are established in the same way.
Mixolydian Mode – This mode is strong but limited. Mixolydian mode on D begins the scale on the tone of A - so la ti do re me fa. The strongest chord relationship is between the tonic A and its subtonic G. Most mixolydian tunes have a chord structure that move between these two chords. In Mixolydian D the chord structure would move between the A chord and G chord. The D chord also fits in these progressions, but it is not strong. Other chords, like the 5th above A, in this case an Em, are weak in relationship to the A chord.
Aeolian Mode – This mode is the relative minor mode of the key and has many of good chord options. The tonic chord of Aeolian D is Bm. Once again the subtonic relationship is strong. So the A chord tends to function something like a V chord in Ionian mode. A chord box for Aeolian D is:
G D A
Em Bm F#m
Bm is the tonic chordin this chord box.
The other strong relationship is between Bm and Em and its relative major G. A common chord progression in Aeolian D is: Bm, F#m, Em, A, D.
|