Six-String Samurai
(1998)

A post apocalypse action comedy.

In an alternative America that was mostly destroyed by a Russian nuclear attack in 1957, the last bastion of freedom is centered around Lost Vegas where Elvis was crowned King. Following the death of Elvis, a Buddy Holly look-alike with a guitar and a sword heads to Vegas to audition for King. Buddy picks up a kid after saving him from an attack. Buddy and Kid survive many more attacks until within sight of Vegas they encounter "Death", who strangely resembles "Slash" from Guns N' Roses. Death takes Buddy down but Kid manages to melt Death with water. Kid then dons Buddy's outfit, picks up his guitar and heads to Vegas.

 Thanks Don P!