http://www.youtube.com/watch?v=Df60ubQYc1g

And when thy heart began to beat,

what dread hand? And what dread feet?

What the hammer? What the chain?

In what furnace was thy brain?

What the anvil? What dread grasp,

dare its deadly terrors clasp?

When the stars threw down their spears,

and watered heaven with their tears.

Did he smile his work to see?                                                                                   

 Tyger!Tyger! Burning bright

in the forests of the night,

what immortal hand or eye

could frame thy fearful symmetry?

W.Blake