2 chord help

[docjohn]

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[docjohn]

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[docjohn]

 2 tunes by a fav B3 player."Spinky" seems to be Dm7 and Gm7 over and over in 8 bar segments.Sometimes,the Dm7 bassline seems to shift from D C A G to D A G F;anybody hear this or is it something else? Why does that simple change of the Dm/F seem to powerful?

Same with Milestones;very simple development=sounds VERY good.Can anybody expound a bit on all that's going on,because there's a few songs like this that really groove!

thanks

[docjohn]

Charles Earland - Spinky