The thing about this movie is that it's about first love. We just wanted it to feel as magical as possible. There's this little shimmer in the music track when she smiles that was really important. There's that point where Gus walks around the corner and sees Hazel all dressed up and he says, 'You look beautiful.' You need to feel the butterflies inside that she's feeling.

The song kind of had to score the moment. Which was hard at first, but then it just gave us a better opportunity to find something that really worked for the scene. We ended up replacing it: partially because we wanted an original song there, and partially because he denied our use. Kent: We had a Bon Iver song in this spot for a really long time. I think the lyrics are really relatable with teenage love. I think that one they're going to make the single. Of the three she did with Dan Wilson, 'Tee Shirt' was one of Josh's favorites. One of those songs was 'Tee Shirt.' The other song was 'Best Shot'. The two of them got together for a few days and knocked out three songs.

We're big fans of his writing, he's written huge hits for the Dixie Chicks and Adele and his own stuff. We had the idea that since she worked with Dan Wilson before, we would have her and Dan do a writing session. It was 'Not About Angels', and she sent it to us in a really rough demo form. We had her see the movie, and then she immediately wrote a song.

She's 17 years old, she has an incredible, haunting sad voice. Kent: When Atlantic came onboard, Birdy was one of the first artists who we felt was perfect for our movie.

The fault in our stars movie soundtrack