Pete Seeger Turns 90

I didn't know that I knew so many Pete Seeger songs. I sang them at camp and the recent sing-a-long in Madison Square Garden in honor of his birthday sounds like it was an amazing evening. I guess that I know many of the protest folk songs without even knowing it --"Where Have All The Flowers Gone" is a favorite.
If he has a 95 year birthday sing-a-long, I will want to go and sing really loud and really off-key.