I'm not one for posting videos (how long will they be here?? - Update 1/19/2009: HBO has already pulled it. *sigh*), but how can you go wrong with Pete Seeger, Bruce Springstreen singing a Woody Guthrie classic (with the subversive verses!) in front of the Lincoln Memorial as part of the Barack Obama pre-inauguration festivities?
Simply awesome.
The so-called subversive verse I've always loved:
As I went walking I saw a sign there And on the sign it said "No Trespassing." But on the other side it didn't say nothing, That side was made for you and me.