Tailgating on the idea of being limited to a three-part harmony; you are going to have to make some choices if you want the sound of a dominant chord, but can only voice three notes.
To remind: a dominant chord is a major triad with a b7 interval above it (and is usually decorated with extra upper extensions as well as tension tones).
Whenever the root, 9, b9, #9, 11, +11, 13, or b13 is in the melody – support it with the 3rd and b7th of the chord underneath it.
Whenever the 3rd or 5th is in the melody of the dominant chord – support it with the b7th, and the remaining 5th or 3rd.
Whenever the b7th is in the melody – support it with the 3rd and 5th underneath it.
Whenever there is an alternation or substitution in the dominant chord – keep it, but make sure the distance between the two upper notes is not a m2.
And more so…
Keep this in mind as you plan how to do a harmonic arrangement and support of your musical work.
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