Sum 41 is a Canadian rock band from Ajax, Ontario. Originally called Kaspir, the band was formed in 1996 and currently consists of Deryck Whibley (lead vocals, guitars, keyboards), Dave Baksh (lead guitar, backing vocals), Jason "Cone" McCaslin (bass, backing vocals), Tom Thacker (guitars, keyboards, backing vocals), and Frank Zummo (drums, percussion, occasional backing vocals).
