Man in the Mirror by Michael Jackson

It's inspirational and it's fun to sing "shamon"

Groove Is in the Heart by Deee-Lite

If you're getting sleepy while driving this is a good one to get your blood going. Plus, you know that part where you get to put your finger in your mouth and make the pop sound, then go "1-2-3" and shake yer cheeks? That's my favorite.

I Get Around by Tupac Shakur

Rapping in the car is always fun and the Shock-G "the one who put the satin in your panties" part is just plain sweet.