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A major to the minor 4th wouldn't exist in standard harmony. It doesnt exist in any of the standard minor scales or standard major scales.
Cm does however, exist in the G Major Spanish Gypsy Scale , and so maybe Jack is right and its a Santana thing...
what do u mean by that? u mean a major chord going to a IVth degree minor chord? not only is it a standard harmonic it's in a bunch of old standards (all of me for example)
I ii0 iii0 iv v VI+ VII