I saw Kenny at the Red Fox Inn in Bethesda, MD in about 1978. He was amazing. (For those who don't know him, he was not only blind, but he picked with just his right thumbnail, which was as thick and strong as any plastic pick one could buy.)

side note: I have mentioned this before...I hope this is a true story

Someone told me of a late night party (in California somewhere) which needed to be 'moved' for some reason. It required going DOWN a flight of stairs to get to vehicles for the trip, and somehow Doc managed to get hold of Kenny Hall's hand. Before anyone noticed, they had 'helped' each other down the stairs.