I don't know jack about hiphop/R&B - it's a blind spot I wanna fix. I mean, from this chart:
...I only know and like RJD2's Deadringer and some songs off the DJ Shadow album above it. For me the insight that he creates an atmosphere based on experience was what finally made me 'get' him. (Hopefully it's a way into the genre.) I think Nikes, White Ferrari and Futura Free do a really good job of this. Nostalgia and Channel Orange are definitely up next for me to dive into though.