You can play Doc Watson's version of Black Mountain Rag at speed.

Let's see...his first Vanguard album came out in '64 or so, and I was originally taken by it, so I've been working on that one tune, on and off, for almost 40 years. Getting there, but I still fumble.

And I have a guitar that can play it at double speed. I've heard it done. But it holds back on me.

Peter.