Music News Net — MUSIC NEWS- Green Day's first tune from their upcoming eighth studio album, 21st Century Breakdown is called "Know Your Enemy ,” and is available now, digitally. After warming up fans with some of the tune's music, the full version has... more info

AngryApe — From their forthcoming 8th album '21st Century Breakdown' more info

Q4Music — Band unveil first taster of new album more info

NME — 'Know Your Enemy' is available digitally worldwide now more info

Altsounds — “Know Your Enemy,” the first single from Green Day’s upcoming eighth studio album, 21st Century Breakdown, is available now. After teasing fans with a snippet of the track, the full version has finally hit iTunes for the wo... more info

Idolator — ARTIST: Green Day TITLE: "Know Your Enemy" WEB DEBUT: April 16, 2008 ONE-LISTEN VERDICT: The first song from 21st Century Breakdown isn't as immediate a listen as the initial single from its predecessor American Idiot; it's a straighter-than-stra... more info

Jam! Showbiz Music, Canada — American Idiots they ain't. Bay Area pop-punk titans Green Day have just released Know Your Enemy, the leadoff single from their much-anticipated eighth album 21st Century Breakdown. more info

VH1 Blog — Green Day freaks have been waiting a while for the superstar punk trio’s follow-up to their monumental American Idiot. But the wildly anticipated 21st Century Breakdown is on its way (due May 15) and to whet appetites, the disc’s first video is b... more info

Gigwise — They play '21st Century Breakdown' in full... more info

NME — Band premiere record at hometown gig - and also find time for some classics more info