Watch the Off to the Races online guitar lesson by Jason Loughlin from 50 Rockabilly Licks You MUST Know
Cliff Gallup has contributed more to the archive of rockabilly licks more than any other guitarist in my opinion. He's inspired everyone from Brian Setzer to Jeff Beck. This intro lick of his was one of his calling cards. It's a lick used for a lot of rockabilly tunes, especially the Blue Caps material. Even though it's a descending major scale I've also heard this one used to set up minor key tunes. Check out Lonesome Train by Gene Vincent and the Blue Caps.