What were the Popular books of 2007?

Top 5 songs of 2007 (based on charts):

1: Beyonce - Irreplaceable

2: Rihanna feat. Jay-Z - Umbrella

3: plain t's white hey there deliah/40 million views yotube

4: Fergie - Big Girls Don't Cry

5: T-Pain feat Yung Joc - Buy U A Drank (Shawty Snappin')