The moment when a great post-hardcore song lurches into high gear is one of the greatest, most exciting moments that music can give us. Think of the tom roll on Fugazi's "Waiting Room," the Ric Flair woo! on Refused's "New Noise," the whoooa-ohhhh-ohhhh break on Black Eyes' "Deformative." I'm hopelessly biased because, at least to some degree, I grew up with this stuff. But for me, most of the time, moments like that trump euphoric house-anthem build-ups and classic-rock riff-surges and big rap hooks that everyone in the room knows. They're just the best. Post-hardcore -- way more than straight-up hardcore, which was once about speed and is now more about constant, brute-force impact -- uses tension as its engine. It's what moves the music forward. So when that tension turns into something like release, it can make you feel like you could knock a minivan over with a headbutt.