What do you jam out to?

One of my small instant rewards in this journey is one itunes song for every pound I lose. Music is a huge part of my life, and I love jamming out to a good song. Working out to music really helps me to get the most out of my workout. I can ride the bike or elliptical while I watch t.v. but I will be slower than if I have music on with a good strong beat.

So, I am looking for some good, upbeat songs that I can workout to. I just put on Pink's "Please don't leave me" which is a little slow for the elliptical, but might be great for the bike, and "Firework" by Katy Perry. I love everything from country to pop, even musical theatre.

Let me know what your favorite song is. (so I can put it on my ipod) What works for you??