a very long time ago, i said something along the lines of, "i'm beginning to think that minor thirds are a very important interval. as in, maybe The Most important." and responded something like, "i see what you mean but you may discover that major seconds are more important." and my idea was--look at the minor thirds in a chord to see where it wants to resolve and how badly. Fm6 wants to resolve to C, G7 and G7b9 want to resolve to C, or to Cm, or if you get sneaky they might go to Am or A, or even F# in some cases. and you look at the common notes here: D, F, Ab, B like to go to chords with their root on C, Eb, F#, A. and a lot of things can be explained by this pattern of minor third series.
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