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So does that mean you can substitute any dominant 7th chord, or just any V chord?
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Hi Noodler,
The answer is yes, you can do a b5 sub on any dominant 7th chord, not just the five chord.
Also, since the pull of the dominant is so strong in a V to I manner, it's common to sub dominant 7th chords for minor chords in a progression.
Your I vi ii V example could become
Gmaj7 E7 A7 D7
Using b5 subs you would get Gmaj7 Bb7 A7 Ab7.
Using b5 subs creates nice chromatic motion in the bass line.
You could also play Gmaj7 E7 Eb7 D7 or any combination of those chords. If you are creating a chord melody arrangement the melody of the song will play a big part in determining which chords to sub and when.
The melody will also determine the quality of the chords. When substituting chords you don't necessarily have to just use dominant chords.
Bob