Altered Dominant with Pentatonic b6 Scale

Lately my practice sessions have involved both the diminished whole tone scale and the pentatonic scale. There’s a reason for this: the two are related, and both scales go well with the V+7#9 chord. My previous post explored how this plays out with a basic major pentatonic scale. I worked with mode 4 of that scale, starting on the b9 of the V+7#9 chord. In root position, the scale would actually begin on the +4 of the chord.

Today during my practice session I focused on another pentatonic scale rooted on the +5 of the V+7#9. It’s a wonderful sound that really brings out both the major third and #9 of the chord as well as the evocative color of the raised fifth. This scale is not your standard-issue pentatonic; its flatted sixth gives it a mysterious augmented quality.

pentatonic-b6-scale
Click on the image to your right to enlarge it. The first thing you’ll see is a D+7#9 chord outlined in whole notes. To its right is an ascending Bb pentatonic scale with a flatted sixth. You’ll see how the scale is entirely consonant with the chord. Moreover, further analysis will reveal that the Bb pent b6 is actually an abbreviated form of the D diminished whole tone scale.

Still more interesting is the fact that the Bb pentatonic scale with a flatted sixth actually is the D+7#9! It’s what you get when you scrunch all the chord tones together linearly (or as near linearly as possible). While I’d love to make myself sound like a master theoretician who has known this fact for most of his musical life, the truth is, I just made the discovery a little while ago. Now I know why this scale sounds so great when played with the altered dominant chord. It is the chord.

Of course the scale has other applications besides the V+7#9, the most obvious being major and dominant chords that share the same root as the scale. I’ll let you work out the various other harmonic possibilities for yourself as they’re not the focus of this post.

Back to the image: The second and third lines introduce you to a basic exercise that will help you start getting your fingers around the pentatonic b6 scale. It would be most helpful if you had some kind of accompaniment sounding the chord when you work on this pattern. You want to internalize the sound of the chord-scale relationship, not just the technique.

It goes without saying, but I’ll say it anyway: Take this exercise through the full range of your instrument and learn it in all twelve keys.

And that’s that. For lots more chops-building exercises, solo transcriptions, and information-packed articles, visit my jazz page.

July 2, 2011 by
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Diminished Whole Tone Scale Exercise with Pentatonic

The diminished whole tone scale (aka super locrian or Pomeroy scale) has been around for a long time, but it’s still a foreign sound to ears that are steeped in basic major and minor scales. For as many years as I’ve been playing it, it’s still not something I find myself idly humming. Nevertheless, it’s an extremely useful scale, full of colors and possibilities for chord superimpositions.

Think of the diminished whole tone scale as a mode built upon the seventh degree of the ascending melodic minor scale. For instance, a C melodic minor scale contains these notes: C, D, Eb, F, G, A, B, C. Start on B as the scale root rather than C and you’ve got a B diminished whole tone scale.

The scale’s primary use is with the altered dominant seventh chord, which it fits like a glove. The diminished whole tone scale contains virtually every common alteration of the dominant chord you can conceive of: b9, #9, +5, and +11. So when you see, for instance, an A+7#9, the A diminished whole tone is a scale option that should come instantly to mind. Like any scale, you can conceive of it as simply a linear repository of tones, all of which relate perfectly to the altered dominant chord.

dim-wt-w-pentatonic-exercise
The exercise on this page explores three of the many harmonic possibilities contained within the diminished whole tone scale. Click on the image to enlarge it. Each four-bar line sets a given scale against its respective altered dominant chord.

  • The first two bars use four-note cells to outline the seventh, raised fifth, third, and root of the chord. The chord tone is the last note of each cluster.
  • The third bar is a mode four pentatonic scale built on the b9 of the chord.
  • The last bar concludes with a simple lick that expresses the major quality of the chord, then hits two of its tension tone (#9 and b9) before resolving to the root.

    • .
    The purpose of this exercise isn’t so much to give you a great lick as to help you dig inside the diminished whole tone scale to see what it has to offer. There’s plenty more to discover, so consider this a springboard to further exploration. You’d do well to use some kind of harmonic accompaniment as you play this exercise, so you’re training not just your fingers but also your ears.

    Practice hard and have fun! And be sure to visit my jazz page for a large selection of other informative articles, exercises, and solo transcriptions that can help you develop as a jazz improviser. They’re all free, so dig in, learn, and grow with me musically.

    June 29, 2011 by
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    Chromatic Couplets: Another Way of Unlocking Diminished and Augmented Scales

    Have you had enough of the augmented scale yet? Hungry to get back to something nice and basic–a good, old-fashioned diminished scale, for instance?

    chromatic_couplets_for_altered_dominants
    How about the best of both worlds. The two exercises shown here (click image to enlarge) take you through two sets of chromatic couplets, each beginning with the note A. However, the first exercise is built on a diminished scale while the second is based on an augmented scale.

    While both scales are symmetrical scales, which implies ambiguity of tonal centers, let’s for the sake of convenience call the topmost scale a Bb whole-half diminished scale, and the bottom scale a Bb augmented scale. A quick glance will tell you that both exercises start on the leading tone of the scale, which also corresponds to an altered dominant chord that the scale works well with.

    I love the ethereal, rather mystical sound of  chromatic couplets used in this fashion. The first half of each exercise emphasizes chordal structure; the second half, without adding any extra pitches, creates a more linear feel.

    Remember, because each scale is symmetrical, it functions equally well with more than just one chord of the same quality. The first pattern, built on the diminished scale, will not only work with an A7b9, but also with C7b9, Eb7b9, and F#7b9. The second pattern is a good choice for A+7#9, C#+7#9, and F+7#9.

    And with that, it’s time for me to wrap up this post and go practice what I’m preaching. For more exercises and articles of interest to jazz and improvising musicians, visit my jazz page.

    November 30, 2009 by
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