Sing, Sing a Song...

I finished my training for indoor cycling now all I have to do is get a program together a 45 minute program. I have most of the program done I just need songs now. I have a feeling iTunes is going to be my new best friend. I need some suggestions of songs that will motivate people, songs that you might work out to, songs that make you happy, or just make you want to get up and go. I need fast songs, slow songs, fast-slow songs anything you can gave me. So feel free to leave me a few of your favorite songs! I would really appreciate it!