Inspired by the first Hunger Games movie, “Safe & Sound” is a lullaby sung by Katniss' character to her 12-year-old sister Prim. In the song, Katniss promises to protect her and keep them both safe, even though she knows she probably can’t. The haunting song was written by Swift and features the duo The Civil Wars with their signature intricate harmonies.
source: Taylor Swift – Safe & Sound Lyrics | Genius Lyrics