1. Thoughtless by S.C. Stephens - I actually recently found a song that I thought just fits this book. It is "Lie About Us" by Avant ft. Nicole Scherzinger. Although in this book the roles would be reversed, since Kiera is the one asking Kellan to wait and keep their love secret so that they don't hurt Denny.
3. Twilight Saga by Stephenie Meyer. I wasn't actually looking for a song for this series. I was searching for a song about woman empowerment, and for whatever reason this popped up on a page. "No Air" by Jordin Sparks Ft. Chris Brown is perfect for Twilight. As much as I love the books Edward and Bella are so attached to each other that they feel like (or plan to be) dying without the each other.