What's your favorite song that has a great guitar/bass riff?

Sludgy, smooth, slow, fast, catchy, loud, what's your favorite bass and guitar riff songs? Here's some examples of my favorites:

Warning - Black Sabbath

Fear Inoculum - Tool

Revolution - The Beatles

Mein Herz Brennt - Rammstein

The Grobe - Ween

American Life - Primus