Let the slave grinding at the mill run out into the field:
Let him look up into the heavens & laugh in the bright air;
Let the inchained soul shut up in darkness and in sighing,
Whose face has never seen a smile in thirty weary years,
Rise and look out; his chains are loose, his dungeon doors are open.
And let his wife and children return from the opressor's scourge.
They look behind at every step & believe it is a dream,
Singing, 'The Sun has left his blackness, & has found a fresher
      morning
And the fair Moon rejoices in the clear & cloudless night;
For Empire is no more, and now the Lion & Wolf shall cease.


William Blake
from America: A Prophecy


A truly atrocious photo from my rubbish cameraphone, but this is Mike Westbrook and his band having just performed his Blake suite 'Glad Day' at the Bath Festival. It's one of the best collaborations with that poet I've heard.