Houston actually has a few Hip Hop levels. There's the national faces like Scarface, UGK (RIP Pimp C), Slim Thug, Paul Wall. You've got the local legends like the Screwed Up Click (RIP DJ Screw, Fat Pat, Big Moe, Big Hawk), and then you've got the underground scene of up-and-coming artists like most cities do.
Kirko Bangz covered almost all the bases here with Thugga, Paul and Ro on his latest track repping Texas. Each of one these dudes have some of the most amazing come-up stories you'll hear.