Sum 41 is a Canadian rock band from Ajax, Ontario, Canada. The band was formed in 1996 and, as of 2016, consists of lead vocalist and rhythm guitarist Deryck Whibley, lead guitarist/backing vocalist Dave Baksh, co-lead guitarist/ backing vocalist Tom Thacker, bassist/backing vocalist Jason McCaslin and drummer Frank Zummo

In 1999, the band signed an international record deal with Island Records. The band released its EP Half Hour of Power in 2000. Although often considered to be the group's debut album, the band members consider their next release, All Killer, No Filler, the group's debut album. The band released its debut album, All Killer, No Filler in 2001. The band achieved mainstream success with the first single from the album, "Fat Lip", which reached number-one on the Billboard Modern Rock Tracks chart and remains the band's most successful single to date. All Killer No Filler was certified platinum in the United States, Canada and in the United Kingdom.