David Gilmour - Wish You Were Here (Unplugged) So, so you think you can tell Heaven from Hell, Blue skies from pain. Can you tell a green field From a cold steel rail? A smile from a veil? Do you think you can tell? Did they get you to trade Your heroes for ghosts? Hot ashes for trees? Hot air for a cool breeze? And cold comfort for change? Did you exchange A walk on..