Let’s take a look at a few things that can be done when an altered dominant chord presents itself in a tune (e.g. Eb7alt). The first thing to know is that the altered chord derives from the altered mode, otherwise known as mode VII of melodic minor. But to break out of the diatonic sound of the scale and gain a little freedom with it, here are a few tricks…
There are 5 different triads that can be used as numerators (the denominator being the basic chord sound, i.e. combinations of chord tones 1, 3, and b7) to get a solid sounding upper structure triad voicing for an altered chord:
You can then combine both minor triadic upper structures and both major triadic upper structures to form two hexatonic scales, which can be used as interesting melodic devices:
- bIImi / bIIImi
- bV / bVI
Now, if you take a closer look at both these hexatonics, you’ll notice that they have five notes in common. These notes make up a pentatonic scale (bV major pentatonic, a.k.a. bIII minor pentatonic), which can also be used as an even more angular melodic device.
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