Even if you don't think you've heard an Ester Dean song, you probably have.
These days the singer-songwriter is starting to make a name for herself as an actress — she reprises her role as Cynthia-Rose Adams, a member of a capella group The Barden Bellas in Pitch Perfect 2, which opens May 15 — but for years, the 29-year-old has been penning hits for some of the world's biggest music stars. BuzzFeed News chatted with Dean to get the stories behind some of her favorite tracks.