On December 2, 2013, it was announced that Lee had teamed up with American composer Dave Eggar to create music for the American drama film "War Story". During an interview with MTV, Lee explained that it would be a "surprise" to her fans; the fact that the film was "dark" and lacking of conversations made it a "beautiful, sad platform for music". She added that for the music she blended various sounds and tones, mostly consisting of keyboard. Speaking about the song "Push the Button" which she originally penned for the movie, Lee explained that it marked a departure for her due to its electronic sound. She added, "I did it all myself, which was crazy, because I'm used to engineering and writing and mixing demos in my house, but being responsible for that being the end product was a new challenge for me." On August 6, Lee announced that the soundtrack album would be called "Aftermath" and that it would be released on August 25. Lee contributes to all ten tracks, which features Eggar on eight of them and American/Moroccan musician Malika Zarra on one. Lee revealed a 36-second teaser of the album on the same day. It is her first full-length solo album to not involve her band Evanescence.