#01. Katy Perry -- "Hot N Cold" [ 30 Days / Peak: #1 (x4) / +1 ]
XTRA:
*Hilary Duff -- "Reach Out"
*The Killers -- "Human"
*The Rasmus -- "Livin' In A World Without You"
*Lady GaGa featuring Colby O'Donis -- "Just Dance"
*Nickelback -- "Gotta Be Somebody" [ NEW ]
*Panic At The Disco -- "Northern Downpour" [ 1 Day / Peak: #10 ]
*Leona Lewis -- "Better In Time" [ 59 Days / Peak: #1 (x8) ]
*Beyoncé -- "Single Ladies (Put A Ring On It)" [ 5 Days / Peak: #7 ]
Fall Out Boy -- "I Don't Care" [ 19 Days / Peak: #3 / +3 ]
Britney Spears -- "Womanizer" [ 39 Days / Peak: #1 (x7) / -1 ]
Katy Perry -- "Hot N Cold" [ 30 Days / Peak: #1 (x4) / +1 ] 
