North America's longest-running traveling festival, the 16th annual Vans Warped Tour, got underway over the past weekend, and for punk-rock fans, the all-ages outing is an absolute must-see. Avril Lavigne, in a statement on her official website, said that she and Sum 41 member Deryck Whibley are splitting after three years of marriage. Sum 41 has mapped out a small trek of mostly East Coast dates this spring following the release of a best-of album and DVD. Canadian pop-punkers Sum 41 have canceled the remaining tour dates scheduled in their home country because frontman Deryck Whibley is suffering from a back injury. For Sum 41 lead singer/songwriter/guitarist Deryck Whibley, the making of his band's latest album, "Underclass Hero," was a frightening experience. For the second straight week, the 25th edition of the "NOW That's What I Call Music!" hits compilation series sits atop the US album chart. Plus: Sum 41, 'Monsters of Rock,' more A satirical letter attributed to Smashing Pumpkins frontman Billy Corgan that appeared last week in a Seattle newspaper was evidently taken seriously by some publications.