Randall Hetlage

first ,a thing called plurals, A7,C#-7flat 5,E-69,and GMAJ7flat5--are all plural. They can be looked at as coming from D Major, but should be looked at a little more closely. A7 (especially sus4) takes Mixolydian Of course.C#-7flat5, Locrian, but the ii-7b5 of B harmonic works much better. The E-69 is definitely Dorian (same relation as the ii v in D ) a blues scale can also work on it as well as the A7 on its root. The fourth mode of B harmonic = E Dorian #4, that works real well. The G maj7b5 wants Lydian, however the third mode of Eb melodic minor is Lydian augmented, it will stretch you're ear a bit. so you see A7 to C#-7b5 = A9, C#-13#11 , E-69 is A13 with no root ,GMAJ7b5=A9 13,again no root-...all of these chords are interchangeable ( hents, PLURAL ,kitten, cat mountain lion , saber toothed tiger.) if you need something from the "feline" "family" ,any one will work in a pinch, just know that you don’t treat a mountain lion the same way that you would a kitty,- its a matter of taste developed through experience. now then, we move to the minor thirds family of dominants...A7,C7 , Eb7 ,Gb7. if you analyze them in relation to one another you will find this ,,,C7 to A7=A7b9#9 , Eb7 to A7 = A7b9#11 (or A7b5b9 ,,tri-tone substitution of A7b5 / Eb7b5b9 ) then Gb7 to A7 = A13b9 (the Gb7 should in this case ,also maintain a b9 as well (the natural 9 on Gb would create a major 7 on the parental A7,not good-) so now you can see the "family" as it is (sort of ,mother, son, sister, cousin

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