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It seems that some substitions only work on specific chords of the same type. Here's an example of what I mean: I've been playing around with a minor 6 a tone below dominant chords eg Fm6 over G7. The thing is if you apply this to all the other dominant chords in the tune it doesn't work. It only sounds good over the chord V dominant of the key eg in the key of C this is G7. When this substitution is taught this is never explained!
I still also find myself scratching my head over the best way to navigate through the last 8 of many tunes. Does anyone know a good book that clearly outlines the substitutions in our style. How they work, why the work and without muddling it with a load of complicated stuff I'll never want to use like altered scales, modes and convoluted chord extensions. I understand that there are many approaches. For me it would be great if someone took several approaches in turn, teaching all the tricks and explaining the pros and cons of each way.