Sum 41, Underclass Hero
Since Sum 41's last studio release, 2004's Chuck, guitarist Dave Baksh has left the Canadian pop-punkers, and singer Deryck Whibley married some chick named Avril. But they've still got plenty of you-know-what-and-vinegar left: Check out the anti-Bush sneak-peak ''March of the Dogs.'' Release date: 7/24

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