“A Thousand Years”
Christina Perri was such a fan of the Twilight movies and series, she got a Twilight-themed tattoo. And after watching an early version of Breaking Dawn, from The Twilight Saga -- during which she cried the entire time -- she went home and wrote a song about the characters Edward and Bella and their love affair. When she learned her song had made the movie's soundtrack, she told Rolling Stone, "I really had to contain myself. I was sweating. I was so excited." The franchise’s huge fan base guaranteed massive exposure for Perri’s love song.