In this video we have the Grateful Dead performing Cassidy.
Cassidy, as you may or may not know, is based on a couple things (the link is an explanation of the song by none other than John Perry Barlow, co-writer of the tune and co-founder of Electronic Frontier Foundation), one of which is Neal Cassady, real dude and Merry Prankster, and the bus driver who took many further than they expected to go; Neal Cassady was also Jack Kerouac's muse for Dean Moriarty.