But, um ... isn't that a slightly odd choice of song for the occasion? (Then again, unemployment, alienation, and despair might be about accurate, these days...)
Kent's dialogue with the Gentleman is abridged from King Lear 4.3. The Fool's song is adapted from Child Ballad 10 ("The Twa Sisters" -- better known to Loreena McKennitt fans as "The Bonny Swans"). I'm not sure who originated the theory about the Fool that I have borrowed here; I don't buy it as canon by any means, but it worked surprisingly well for this particular story.