It's a rendition of Joni Mitchell's I Don't Know Where I Stand from the first Fairport's album, and it made me all misty-eyed when I watched it.
Thanks to David Johnston-Smith for the heads up on this one.
"The quality of our perceptions determines the quality of our judgement. Our judgement determines how we interact with the world.
How we interact with the world changes the world. So, the quality of our perceptions changes the world."