I fibbed. One more today, then I step away from the mic.

This is a version of the very same thing, but with the chord progression changed so that there are no chromatic notes AT ALL—but every chord still has a 7th, or a 6th, and some have extended harmonies like 9ths or 13ths.

The voicing goes back and forth between closed and open.

IF this is still Jazz, then notice: it aint the chromaticism that does it (though it helps). It aint the closed voicings (though it has a particular effect). It's the 7th chords. Put 'em everywhere.