How about: Doc Watson's intro to "Deep River Blues"

Geoff Muldaur's intro to "Devil Got My Woman"

Mississippi John Hurts "Creole Belle"

Bruce Cockburn's "If I Had A Rocketlauncher"

And Stevie Ray Vaughn's intro to "Cold Shot" and the bass intro to "Crossfire"

Or even The Chambers Bros "Time Has Come Today"