"Hostage" was included as the eighth and final track on Eilish's debut
EP ''Don't Smile at Me'', released on August 11, 2017. The song was written by Eilish and her brother
Finneas O'Connell, known under his stage name of Finneas. He was also solely responsible for the song's engineering and production.
Mixing was done at The Fortress of Amplitude by
Rob Kinelski and
mastering was handled by John Greenham. Musically, "Hostage" was described as a stripped-down
pop track. Lyrically, it begins with Eilish being in a happy relationship: "I wanna be alone. Alone with you, does that make sense?" she harmonizes with Finneas. Then, in the same melancholy tone, she turns possessive towards her lover, and wants them for herself. ==Reception and promotion==