What is smooth jazz? George Duke - Because You Loved Me

Okay, so some may say this isn't strictly smooth jazz, and some other may lynch me for even relating it to smooth jazz, but here George Duke (one of my favourite keyboard players of all time, may he rest in peace...) can be see playing a reharmonised version of Celine Dion's "because you loved me", featuring legendary smooth jazz saxophonist Kirk Whallum.  I tried transcribing some of the chords.  The original track had a large plethora of extended and non-diatonic chords in it, so it was harder to tell which chords were reharmonised and which were just different versions of the chords already in the track.

I found that Mr. Duke uses a lot of major sixths throughout the song.  I've noticed that elsewhere too. Maybe a rule of some sort could be "If you have a major triad, add in a major sixth for colour".  Something along those lines.  Simple rules like that will likely make up most of the ruleset.  The rules don't have to be complicated - they simply have to work.

Anyways, here's the recording.  I recommend listening to it all the way through.  I'm not a Celine Dion fan (who am I kidding...) but I'm a big George Duke fan, and this is phenomenal.

Note the spine-tingling use of tension and release starting at 5:05.  When I talk about tension and release and it's effectiveness in my dissertation, this is what I mean.  Unbelievable.