The first single from 21st Century Breakdown is “Know Your Enemy,” which will heard on radio and be available for purchase from all online retailers this April... Album artwork has been released. Singer-guitarist Billie Joe Armstrong, bassist Mike Dirnt, and drummer Tre Cool have been at work writing, arranging, and recording 21st Century Breakdown since early 2006 and are currently making finishing touches with producer Butch Vig, who is known for his work with Nirvana, Smashing Pumpkins, Garbage, and many others.