My guitar teacher assigned me Buddy Guy's "Damn Right, I got the Blues" for some evil reason. Right off the bat, Mr. Guy counts down and then plays the opening notes slower than what he just counted. I've listened to Guy quite a bit, but never noticed how much he slides in and out of the beat. It's like a madman's rubato, and very hard to replicate. I guess I'm stuck with just listening, getting the notes, and then playing along if I want to match it-- unless somebody has any tricks or tips!