TOTM - You Don't Know What Love Is - ETUDE by Tony Miceli
Listen, follow with the music. Write the chords in. Write what they are exactly. Write What they look like. For example, IT IS A C7#9 #5. However it looks like a Bb-7b5. It's not, but it looks like that. Understand?
Then play it. I would memorize it and then move the key at least once. That's how you learn harmony and voicings.
This is a 2 or 3 part series. (Have to decide). I'll add another chorus or two soon.