What is your Favorite 'Opening Track' of Any Album

London Calling, I can just imagine buying that album to see what the fuss is about around the new sound of the Clash and hearing those first 3 chords. Never have I heard 3 chords that spoke so much on their own, I could listen to them looped for 3 minutes. Then the bass kicks in and the snare, and Strummer rolls the opening line off of his tongue with attitude that if you'd never seen him you'd assume that skinny assed white boy was a big, burly Caribbean.

You could have switched off that record after the opening track, and known it was a classic. That song just epitomizes the annunciation of something fresh and new that an opening track should be.