I actually had to look up R&B to answer your question about the songs proper Genre, and my interpretation of it comes off as "Jazzy Blues". The Trumpet in here definitely puts this song into the R&B category from how I see it.
As for the song itself, I dig it, it slips to the back of my mind where it lives rent free. For some reason the song doesn't loop properly. I dunno if its me or whatnot. Not the end of the world though.
If this were used for anything, I totally could see this song used as a BGM track for an RPG or Visual Novel. Where the Protagonist and a group or crew of characters are casually hanging out in an "out of sight" location like an alley or abandoned building, discussing their plans and ambitions or getting to know one another as they determine their next move.