Best album openers?

What are, your opinion, some of the best first tracks of an album? Songs that aren't simply just good music, but also serve as a quality introduction to the sound, feeling, and vibe of an album. Some personal choices of mine are:

Hell's Bells - AC/DC (Back in Black)

In the Flesh? - Pink Floyd (The Wall)

Death On Two Legs - Queen (Night at the Opera)

You - Radiohead (Pablo Honey)

Wouldn't It Be Nice - The Beach Boys (Pet Sounds)