This is a video of P,P,&M preforming at a rally in DC on April 24 shortly after the veterans were on the mall, mentioned by them in Give peace a chance - Kerry spoke to the Senate on April 22.
http://www.youtube.com/watch?v=q8U6Oh9uSY8I thought of Peter and Paul speaking about Blowing in the Wind at the JK 45 years of service celebration. They spoke of how Mary was always asked her favorite song and how she always said that songs were like kids - on different days, different ones were the favorite depending on what they had done - but you really loved them all the same. But, finally, after years, she had said that Blowing in the wind was the the real favorite. (i hope I got that reasonably right, but if wrong, I hope someone will correct this. )