Good music to work out to.

As many people have recently said on here that they have had a wake up call healthwise because of Deano and Dan, I thought I'd ask what music on the old MP3 player gets you working really hard when at the Gym.
I was on the Cross Trainer this morning and I usually plod along at a steady pace, but 'Ace of Spades' by Motorhead came on my MP3 just as I started training and the speed of that thing made me really go for it! I had to keep up with it!
I was knackered by the end of the song.
Then later, 'Ten Inch Song' by Aerosmith came on and that made me really go for it, too.
What songs encourage you to work that extra bit harder when exercising?
I was on the Cross Trainer this morning and I usually plod along at a steady pace, but 'Ace of Spades' by Motorhead came on my MP3 just as I started training and the speed of that thing made me really go for it! I had to keep up with it!
I was knackered by the end of the song.
Then later, 'Ten Inch Song' by Aerosmith came on and that made me really go for it, too.
What songs encourage you to work that extra bit harder when exercising?