Sum 41 cited Refused as an influence .
Sum 41 cite Green Day , NOFX , Treble Charger , Metallica , Slayer , Rancid , Pennywise , the Beatles , Elvis Costello , Guns N ' Roses , Iron Maiden , Beastie Boys , Run–D.M.C . and Rob Base and DJ E-Z Rock as their influences.
Sum 41