Underground that I listen to is Rhymesayers or Def Jux mostly... check out

Can Ox Cold Vein
el-p Fantastic Damage
Jean Grae Attack of the Attacking Things
Brother Ali .. anything he's done.. Shadows on the Sun, Champion EP

The last one, Brother Ali.. anyone will like him, even if you don't appreciate underground shit... he's just fucking good.

You can get a bunch of their songs off kazaa... they're all over...

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RIP SMOKAJOKA WE WILL MiSS YOU!!!!!!