What's on my iPod

Okay, what's on my iPod?  Let me think, it's pretty full right now.  Have you seen that commercial where the girl asks a boy what's on his iPod and 50 years later he's still telling her...well, my list isn't that long, but it's a pretty hefty! 
Keep in mind -- I have to have songs with a great beat when I run and I'm on the treadmill a couple times a week...so I sweat to top 40!  Here goes...

Nickleback
Rihana
Britney
Mariah
Maroon 5
Justin Timberlake
Kelly Clarkson
Timbaland
Jennifer Lopez
Nelly Furtado
Celine Dion (I know that doesn't really fit...but I do have to cool down sometime!)