I love a lot of the songs, but one that I picked that fit Bella and Renesmee was a song called Farewell, Solitaire, or if you call it by its true name Sayonara Solitia. It is Japanese but I looked up its lyrics. Its such a beautiful song. Here is the translated lyrics.
It's because I love you so much that I hurt you, that I'm so confused
Coming close to your cold cheek, my soul was born
I always want to see you right away
I love you so much I can't speak, so how will you see my kindness?
Hold me tighter, I believe in your warm heart
Farewell, solitaire, to tomorrow
Because I'm so small, I give everything, but it's not enough
This hand, which can't hide anything at all, I want to give to you
We still have to see off the white dawn
Why was I able to run across someone this important?
Holding on to these fingers that they almost hurt, I see the dream that had disappeared into sadness
Because I'm no longer alone, tomorrow awakens, and I'm with you
Because I have someone whom I love so much, I'm here by your side, protecting you
I'm so glad that I was born on this earth that connects me to you
More than Just a Twilight Fan...