I think Smooth Jazz might be just a label rather then a genre, but maybe you could discuss that forever without coming to an agreement.
http://www.smooth-jazz.de/what_is_smoothjazz.htmlMy very personal view on Smooth Jazz is defined by artists like Brian Culbertson, Brian Simpson, Cindy Bradley, Dave Koz, David Benoit, Euge Groove, Gerald Albright, Richard Elliot, Rick Brown and the one and only Shakatak, just to name a few.
The Bruno Mars R&B stlye sounds great, for sure I will be a regular customer for styles of the kind.
By coincidence today I found an inquiry of Yamaha Music Europe in my mailbox asking about my needs regarding arranger software, and needless to say I was asking about styles for smooth jazz / funk styles. If you're into that type of music don't miss to speak up. This was the link for that inquiry, I'm afraid it's in German language, don't know about similar surveys in English:
https://sslsurvey.de/EKB-MusicSoft-DE-2018