Friday, July 9; Launchpad (all ages, 8 p.m.): Forget John Denver, John Elway aspen trees and all that “Rocky Mountain High” crap. Denver's finest export, in my opinion, will always be Cephalic Carnage. Their new record, Lucid Interval, will prove unlistenable even to some of the most dedicated grind fans with its hellish mixture of jazz stylings and death metal, but those who are still able to open their THC-bound eyelids wide enough to see the future of grindcore will rejoice and perhaps even leave their beanbag chairs in jubilation. The Mahavishnu Orchestra have nothing on these guys, who careen from 4/4 blastbeats to 7/8 segues with the precision of brain surgeons. If extreme is what you ’re looking for, look no further. And you don't have to be 21 to enjoy this pummelling.