Sum 41's fourth album, "Underclass Hero," has been set for a July 24 release via Island. The title track will serve as the first single and will be serviced May 15 to U.S. rock radio outlets.

Sum 41's fourth album, "Underclass Hero," has been set for a July 24 release via Island. The title track will serve as the first single and will be serviced May 15 to U.S. rock radio outlets. Another song, "March of the Dogs," is available starting today (April 17) via iTunes.

The group, which is now a trio consisting of vocalist/guitarist Deryck Whibley, bassist Cone McCaslin and drummer Steve Jocz, has a handful of live dates on its spring and summer schedule, beginning May 4 at Memphis' Beale Street Music Festival. Sum 41 will also play five shows on the Vans Warped Tour in mid- and late August.

"Underclass Hero" is the follow-up to 2004's "Chuck," which has sold 474,000 copies in the United States, according to Nielsen SoundScan.

Whibley fans can also hear him at work on his wife Avril Lavigne's new RCA album, "The Best Damn Thing," which was released today.