I saw Doc Watson at a festival in Arkansas in the early 70s, when I was living in Columbia, MO. I think he was playing with Merle at the time, but I have to admit my memory is not the clearest about this particular festival, except I remember there was a thunderstorm and then incredible mud.
I have tried to learn flatpicking ever since, and I am still--and will always be--in complete awe of Doc's skill. Happy Birthday, Doc Watson.