Sounds like you’re much more initiated with the rap world than myself. Though when you mentioned 2Pac I did hear some resemblance. I’ve never heard NAS, maybe I should start listening.
There’s a bar at JiuYanQiao that has some kind of open mic for rap, etc. I stumbled into it once. Some pretty interesting guys on stage. Seems that the chinese languages naturally lend themselves to rap/spoken word. Chinese pop, on the other hand, nearly unbearable!