Ashlee Simpson's "Pieces of Me" (iTunes link) is an absolutely superb piece of power pop. I'm saying it goes to #1 on the charts and stays there a while.
Just listen to her wail,
Ohhhhhhhhhhhhhh
It seems like I can finally rest my head on something real
I like the way that feels
Ohhhhhhhhhhhhhh . . .
Better yet, don't just listen, throw your head back and wail with her, your jaw hanging wide open and your eyes almost shut from the effort, and feel the endorphins flow. That is a pop song.