One of my favourite parts of the Bob Dylan documentary, Don't Look Back. The tension between Dylan & Baez is noticeable since they were towards the end of their relationship when this was filmed, but I still think a beautiful moment is captured here, a natural, unpolished interaction.
I really wish there was a recording of Joan Baez singing Percy's Song (the first song she sings), it's beautiful.
P.S. Did you notice Marianne Faithfull's brief appearance?