Sum 41
Sum 41 at Rock am Ring 2017. from left to right: Drummer Frank Zummo, singer Deryck Whibley, bassist Jason McCaslin, guitarist Dave Baksh. Guitarist Tom Thacker is out of frame.
Background information
Also known as	Kaspir (1996)
Origin	Ajax, Ontario, Canada
Genres	Punk rock pop punk skate punk alternative rock alternative metal melodic hardcore
Years active	1996–present
Labels	Island Aquarius Hopeless
Website	sum41.com
Members	Deryck Whibley Dave Baksh Jason McCaslin Tom Thacker Frank Zummo
Past members	Steve Jocz Jon Marshall Richard Roy

Sum 41 (sometimes called The Sums, originally called Kaspir) is a Canadian rock punk band from Ajax, Ontario. The people currently in the band are Deryck Whibley (lead vocals, guitar, keyboards), Cone McCaslin (bass guitar, backing vocals), and Steve Jocz (drums, percussion, and backing vocals). The band's most known lineup is the same, except with Dave Baksh on lead guitar and backing vocals.