Aesop Rock is a man of ideas. So many, in fact, that it's hard to keep track of them all. He hasn't released a lot of records in the ten years he's been around, but unpacking his dense lyrics could keep a dedicated fan busy for a lifetime--and with the addition of his latest, None Shall Pass (Definitive Jux), that study's gonna take at least a few more years. With a style somewhere between the precision flow of Kool G Rap and the verbal diarrhea of a schizophrenic on the bus, Rock delivers far-out rhymes thick with cryptic imagery: "They grew 'em in the royal dirt of Suffolk County's flooring / With the blood of an alcoholic clergyman in his forearms," for instance. Though his words definitely overshadow the music, the dark, blunted beats are far from filler, alternating mostly between hazy boom-bap and Rock's ongoing attempts to rescue hip-house from its own shitty legacy. None Shall Pass contributors Rob Sonic and DJ Big Wiz join Rock onstage; the Octopus Project and Blockhead with DJ Signify open. a 6:30 PM, Metro, 3730 N. Clark, 773-549-0203 or 312-559-1212, $18.50.