Taylor Swift says writing about her private life makes her "very vulnerable".
The 'I Knew You Were Trouble' hitmaker has begun recording songs for films and sees it as a different kind of "thrill" compared to the "intense" process of baring her own life on record.
She told Billboard magazine: "I think it's a bit of a relief to take the focus off of my own life. "It can get pretty intense writing [personal] details - that's a very vulnerable place to put yourself in.
"But there's a specific type of thrill you get from that recounting of your life."
The 24-year-old singer recorded the song 'Sweeter Than Fiction' for 'One Chance' - the movie based on the life of 'Britain's Got Talent' winner Paul Potts - and was proud of getting "someone else's emotions" across in the right way.
She added: "There's a different kind of thrill you get hoping you have accurately portrayed someone else's emotions that you're seeing so well done by these actors, James Corden and Mackenzie Crook.