Sum 41 is a rock band from Ajax, Ontario, Canada. Originally called Kaspir, the band formed in 1996 and currently consists of lead vocalist/rhythm guitarist, Deryck "Bizzy D" Whibley, lead guitarist/backup vocalist Dave "Brownsound" Baksh, lead and rhythm guitarist/keyboardist/backup vocalist Tom "Brown Tom" Thacker, bassist/backing vocalist Jason "Cone" McCaslin and drummer Frank Zummo.