29. Duffy - "Mercy"
It seemed to be a struggle to put together the Pocketful of Sunshine album, but when the project was finally put together, the title song became one of the most memorable pop hits of the first half of 2008. Natasha Bedingfield looks like she is here to stay.
Creepy sounds kick the song off, and it is accompanied by a weird freak show of a video. Rihanna is one of the very few pop artists big enough right now to get radio programmers to take a song as offbeat as "Disturbia" seriously. Few pop fans are likely to forget this recording any time soon.