One of the greatest albums of all-time, it's hard to pick one song out of so many great ones. Being forced to choose, I'll go with 2 Minutes, as afterall, it was the song that first introduced me to the band, so it holds some special memories.
This reminded me of the prats on the official Maiden BB who'd accuse Adrian Smith of ripping the riff for Two Minutes To Midnight off Tokyo Blade. And then Accept. And then White Spirit. And yet it was always Mr Smith's fault sorry, memories flooding back...