JMI Educational Blog: Working with Triads – PART II

by Travis Jenkins – lecturer at JMI

Last week we looked at the importance of triads and how to effectively use them in constructing melodies through major harmony.  For a recap, check out Part I of Working with Triads.

This week we’re going to look at expanding on this concept even further.  We can apply the same idea to other scales like for instance, the melodic minor (1 2 b3 4 5 6 7) or octatonic (diminished) scales (1 : ½ or ½ : 1).

The more commonly used modes of melodic minor would be (all based off a C root):

Cmi(maj7) – Melodic minor: C D Eb F G A B
Cmaj7#5 – Lydian augmented: C D E F# G# A B
C7#11 – Lydian dominant: C D E F# G A Bb
Cmi9b5 – Locrian #2: C D Eb F Gb Ab Bb
C7(#9b9#5b5) – Altered: C Db D# E Gb G# Bb

Here are some of the more useful triads from each mode that will highlight the upper structures/extensions.

Cmin(maj)

G triad: 5 7 9  (See fig 4a.)

Eb aug triad: b3 5 7  (See fig 4b.)

CMaj7#5

E triad: 3 #5 7  (See fig 4c.)

C7#11

D triad: 9 #11 13  (See fig 4d.)


Bb aug triad: b7 9 #11  (See fig 4e.)

Cmin9b5

Bb triad: b7 9 11  (See fig 4f.)

C7(#9b9#5b5)

Ab triad: #5 1 #9  (See fig 4f. above – Db triad over the F7alt.)
Gb triad: b5 b7 b9  (See fig 4f. above – B triad over the F7alt.)
Ebmi triad: #9 b5 b7
Dbmi triad: b9 3 #5  (See fig 4g.)

The diminished scales have an interesting array of triadic possibilities being that they are equally symmetrical in nature, meaning that you can find both major and minor triads repeated at even intervallic increments.

The “1 : ½” diminished scale (whole step : half step) corresponds melodically to a diminished 7 chord:

(C) D (Eb) F (Gb) Ab (A) B

The chord tones being 1 b3 b5 bb7 and the extensions being 9 11 b13 b15 (major 7).
There are 4 major triads and 4 minor triads to be found within both diminished scales, as they are both identical in terms of intervallic structure (though stress different tonics).

The C whole/half scale contains B, D, F, Ab, Bmi, Dmi, Fmi and Abmi triads, though I find the major ones to produce stronger melodic potential.

B triad = 7 b3 b5 (makes for a beautiful voicing and great melodic potential as it is the major triad a half step below the root)  See fig 5a.

D triad = 9 b5 bb7 (similar qualities to the aforementioned)
F triad = 11 bb7 1
Ab triad = b13 1 b3

The “½ : 1” diminished scale (half step : whole step) corresponds melodically to a diminished dominant chord (like a mix between an altered dominant and a lydian dominant):  (C) Db D# (E) F# (G) A (Bb)
The chord tones being 1 3 5 b7 and the extensions being b9 #9 #11 13.

The major triads to be found within this harmonic system are C, Eb, Gb and A.  (There are obviously many more but I’ll just focus on some of them).

Eb triad = #9 5 b7
Gb triad (the tritone substitution) = b5 b7 b9
A triad = 13 b9 3 – this one makes a beautiful voicing for a 13b9 chord and provides fantastic melodic material.  See fig 5b.

Other noteworthy mentions are the symmetrical augmented scale:  which moves in repeated increments of a minor 3rd followed by a minor 2nd, and is built around 3 major triads, all major 3rds apart.

ie. C, D#, E, G#, A, B.  With C, E and Ab (G#) major triads contained within the system of intervals.

As well as the use of triad pairs in something as simple as say the harmonic minor scale:
C, D, Eb, F, G, Ab, B.  Containing both a G and an Ab major triad, which being separated by a minor second, produce some really interesting melodic applications.   See fig6.

But we can expand upon triad pairs in another article.  Be sure to expand upon each individual concept.  Obviously the triad practice exercises are only for C major mode series and can be applied to any scale in any key, and there are virtually limitless combinations of patterns that you can come up with to practice.  In fact, it would be more beneficial to yourself to find your own ways through this material as that will help to develop your own personalized musical vocabulary.  When your transcribing next, see if you identify the uses of triads in other people playing!

Happy shedding.

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