LAUNCH - Sum 41 had to postpone three shows at the end of last week when frontman Derick Whibley ruptured a vocal chord, according to Billboard.com. Whibley was "ordered by doctors not to perform," the shows' promoters said in a statement. The band scrapped two gigs in Toronto, Ontario, Canada on Thursday (February 3) and Friday (February 4), as well as a Saturday (February 5) date in London, Ontario. The concerts have been rescheduled for mid-April.{br}{br}View the Entire Article{br}