It varies for me depending upon the mood I'm in when I have the workout. Today I'm in a really good mood so probably something from the 80's:

Bon Jovi's Slippery When Wet or New Jersey CD's
Eurythmics: Would I Lie To You? always pumps me up
Queen: Fat Bottomed Girls
Def Leppard: pretty much anything by them
Kiss: Rock Hard, Let's Put the X in Sex, Heaven's On Fire
Quiet Riot: Cum On Feel the Noize or Metal Health

A couple of more current ones that get me going are S.O.S. by Rihanna and Temperature by Sean Paul.

Those are just a few.

__________________
It takes a gutless mouse to play only when the cat's away.

No love, no friendship, can cross the path of our destiny without leaving some mark on it forever. ~~ Francois Mocuriac

Confucius say, "He who masturbate into cash register come into money."

An optimist looks at the glass and says it's half full. A pessimist looks at the glass and says it's half empty. A Cubs fan looks at the glass and says, "When's it gonna spill?"

Deus Impetitio Esuritori Nullus