Buy

emuso

Ideas for the Dorian added b6,7 scale (1)

Jerry

Being creative with diminished triads blended with minor pentatonic

Barry Harris, the legendary jazz bebop pianist, added a b6 to the jazz minor scale, to produce a bebop scale.  This is my variation on this, by adding a b7 as well.  This opens up a whole new world of sound,with great possibilities in many genres including blues, rock, metal, jazz … you name it. 

Theory

One way of thinking about this scale is offering a minor 6th chord rooted at the tonic, and a diminished 7 chord rooted at the 2 (4, b6, 7).  It also hosts the usual minor pentatonics from Dorian (rooted off the 1, 2 and 5 of the scale).  You can also think of the diminished 7 chord as hosting four diminished triads, rooted off each of notes in the diminished 7 chord.  So you have diminished triads rooted at the 2, 4, b6, and 7 of the scale.  This is additional to the diminished triad rooted at 6 of the Dorian scale

So here is a short taster video demonstrating this on emuso, with a mix of vertical (across the neck) and horizontal (along the neck) ideas. I’m mostly playing each diminished triad from its top (treble) note to its bass note.

Application

When you use the full dimished seventh chord, the music takes on a very definite flavour, where the chord sound is very obvious.  This of course is a great sound to use.  However, the diminished triad is more subtle, and doesn’t stand out as much, especially if we use it briefly to introduce a minor pentatonic (blues) idea.  I started exploring this as a way of taking Barry Harris’s method out of the province of the jazz genre, and adding fresh ideas to modern blues, rock etc. 

Essential skills

You need to be able to visualise a b3 interval using adjacent string pairs in either direction.  Practice these independently. For example, using the G and B strings, you should be able to start at some arbitrary fret on the G string, and go up or down a b3 by crossing to the B string or crossing to the D string. Practice with your eyes shut and your ears wide open.  You should be able to visualise a b5 interval also, so you easily reorder the sequence of notes you play from the diminsihed triad.

For example, on the G string, play the 7th fret, followed by the 6th fret on the B string, then the 9th fret on the B string.  Or from the 7th fret on the G string, go up a b3 to the 10th fret, then back a b5 to the 9th fret on the D string.  These are all easy to visualise … just remember how the G,B string tuning affects the interval shapes.