Most of the tracks on Halcyon are breakup songs penned by Goulding about her former partner, BBC Radio 1 DJ Greg James. However, she wrote this gothic tune about being weakened by somebody emotionally in the midst of a relationship.
The song features on the soundtrack of the movie, Divergent. It is one of a quartet of Goulding tunes that are woven into the action of the film. The singer also provided the "musical voice" for lead character Tris Prior (played by Shailene Woodley). "For me, the movie is about a young woman finding herself, transforming herself and becoming powerful on a societal stage," explained director Neil Burger to Entertainment Weekly. "It's an intimate, personal portrait, but on a grand scale. Ellie's music has that very intimate quality. You are in the heart of her characters, in their souls, in their minds. When she sings her voice resonates inside you. Her music was a perfect way to do all that for Tris - to feel what she was feeling inside."
There was a rumor in the Soviet Union that The Beatles had secretly visited the U.S.S.R. and given a private concert for the children of top Communist party members. They believed the song "Back In The U.S.S.R." was written because of the concert. Actually, some fans still believe so.