In the annals of underground rap, few have been more prolific or more successful than Kansas City, Mo., native Tech N9ne. Even before every musician and his mom were all, “Indies are the future of music,” N9ne was hustling his own harder-than-hardcore rap and moving more units than most major label pretty boys. He’s a pioneer, an innovator and quite possibly a lunatic of Hannibal Lecter-ian proportions. (OK, that’s just his character, but suspension of disbelief is fun!) And while he may have inspired legions of Juggalos to put lyrical atrocities on tape and do bad, bad things to poor defenseless animals, don’t hold that against him — it’s not his fault those kids are dumb. N9ne has been making ruthlessly bold, unapologetically wild music for the better part of two decades, and on his latest full-length, All 6s and 7s, he proves he’s not going anywhere anytime soon. Krizz Kaliko, Prozak, Mayday and Stevie Stone open.