This pretty much states who Gregory Porter is;
https://en.wikipedia.org/wiki/Gregory_PorterToday is the first day I've seen it too, which means we know the same things at the same time.
When I heard him I could tell he had talent plus a God given voice; what I also heard was (formal) musical education.
It seems that in the past everyone understood me to say that formal education was unnecessary because some of my favorite musicians lacked it. When formal education was not an option, that was moot; fortunately, it seems that current musicians not only know how important it is, but they manage to get it.
In regard to a category for his music, that might have to wait; or we'll decide together.