Doc Watson - 1991 - Black Mountain Rag. I've included Doc's introduction and explanation of his background with this particular tune.
I've always loved the interesting anecdote that Doc developed his now legendary flatpicking style while playing a Les Paul (electric solid body guitar) while he was playing in a Rockabilly band in the 1950's. Additionally, I've heard that he actually didn't even own an acoustic guitar at that time.
It's interesting that this style has since become associated with, nearly exclusively, acoustic guitars, particularly Martin dreadnoughts.
I've always wondered what kind of reception a picker would get at the National Flatpicking Contest in Winfield Kansas if he were to show up to compete with a Les Paul in hand!