Mine's Rage Against the Machine's "Killing in the Name".

Great band, terrible politics.

Probably the only one here but Bohemian Rhapsody by Queen, Wayne's World came out when I was in high school. 

My second favorite is Enter Sandman.

It's difficult to pick one, but the opening riff here, is one of my favorites:

Pink Floyd - Wish You Were Here

Up Around the Bend by CCR.

Time - Pink Floyd

Time - Pink Floyd