This lesson brings together everything you’ve learned about the dominant and Dorian pentatonic scales and shows you how to use them to create altered sounds — the tense, searching quality you hear on dominant chords in jazz and fusion that makes the resolution feel so satisfying. Best of all, you don’t need to learn any new shapes: it’s the Dorian pentatonic you already know, played a half step higher.
What you’ll get out of this lesson: You’ll understand why playing the Dorian pentatonic up a half step over a dominant chord creates an altered sound, what intervals that produces, and how to apply it alongside the dominant and Dorian pentatonics to navigate a blues or jazz progression.
The concept: superimposing a scale
This lesson introduces an important idea that will serve you well beyond this course: superimposing a scale means deliberately playing a scale whose root is not the root of the chord you’re over. By doing this for harmonic reasons, you imply sounds and colours that wouldn’t be available if you only ever played scales rooted on the chord. The altered pentatonic is a clear example — you play the Dorian pentatonic from a root a half step above the chord, and the resulting intervals are exactly what altered harmony calls for. Note that the red circles in the diagrams indicate the position of the chord root you’re playing over — don’t play those notes as part of the scale.
Why a half step up works — two explanations
By playing the Dorian pentatonic up a half step from the root of a dominant chord we get the following intervals: b9, 3, b5, b13, b7. These are all notes that fit well over an altered chord or any situation where you want to create an altered sound, and you will also find these notes in the altered scale.
There are two ways to understand why this works. First: the altered scale is the seventh mode of the melodic minor scale, meaning to play the altered sound over a given root, you play melodic minor from a half step above that root. The Dorian pentatonic is a reduction of the melodic minor scale — root, flat 3rd, 4th, 5th, flat 7th — so playing it up a half step gives you a subset of the altered scale. Second: you can think of it as playing the dominant pentatonic a tritone away from the root — a scale-level tritone substitution. Both explanations lead to the same place; use whichever resonates most.
“All we do is whatever chord we want to play the altered sound over… we’re just going to go up a half step. And we’re going to play the Dorian pentatonic from up a half step.”
Putting all three sounds together
You now have three closely related tools drawn from the same family of shapes. Over a dominant chord: dominant pentatonic rooted on the chord. Over a minor chord: Dorian pentatonic rooted on the chord. When you want altered tension on a dominant chord: Dorian pentatonic up a half step. Practise this by finding a blues backing track and cycling through all three approaches, paying close attention to how each one sounds and feels against the underlying harmony. Apply the Dorian pentatonic to minor chords, the dominant pentatonic to dominant chords, and the altered sound — the Dorian pentatonic up a half step — to altered chords. Just get it under your fingers and start applying it.
Taking it further: Try introducing the altered sound on the last beat or two of a dominant chord rather than from the beginning of the bar — this is how it’s most naturally used in jazz and blues, creating a brief moment of tension that resolves cleanly when the next chord arrives. Listen to recordings of Robben Ford or players with a jazz-blues background to hear this approach in context.
Your homework: Find a blues backing track in any key. Use the dominant pentatonic over the dominant chords, the Dorian pentatonic over any minor chord sections, and try inserting the altered sound (Dorian pentatonic up a half step) on the last beat of a dominant chord before a resolution. Record yourself if you can — listening back makes it much easier to judge whether the altered sound is landing in the right place and resolving convincingly.