Bob Dylan's masterpiece visual accompaniment for "Subterranean Homesick Blues, perhaps the best music video of all time, is filled with lore. First, that's Beat legend Allen Ginsberg standing off to the side, looking much like our own Ron Barker.

Second, Dylan says that he doesn't "need a weather man to know which way the wind blows." Most agree that radical, underground protest group The Weathermen, which formed in 1969 after spiltting from the Students for a Democratic Society, took its name from this phrase.

The rest of the video is a piece of history you should know.