My niece sent me the first link, Why I Am Opposed to the War in Vietnam, which is as relevant today as it was then.
And for the second, I Have A Dream, came, of course, at “the greatest demonstration for freedom in the history of our nation” against the “flames of withering injustice” and “the long night of [our] captivity”
The third is Miri Ben-Ari’s Symphony of Brotherhood, an uplifting and haunting piece of music that resonates deeply with me. I’m not a big fan of music videos, and this one is not particularly well done, so I listen to it with the video in the background. It’s the music that speaks.
Neuroanthropology 
Taylor Branch has an inspiring essay, The Last Wish of Martin Luther King, on Dr. King and his legacy. Here is one quote: “Dr. King showed most profoundly that in an interdependent world, lasting power grows against the grain of violence, not with it.”