Here's a great live version from the Seventh Tour of a Seventh Tour, circa 1988 or 89, I imagine.
Whenever I hear Steve Harris' bassline something akin to an electric shock courses through my body, then my heart starts to race when Dave Murray plays that familiar riff. That's how much I freaking love this song. It exalts the spirit.
Four days away. I can "Feel the sweat break on my brow" in anticipation.