I have also included a behind the scenes, "The making of" clip. Shows how the teachers without their music trolley used technology and a crisp wrapper to create a simple sound track.
On the iPhone he used the app Ocarina for the music and she uses a crisp wrapper for the sound of fire ripping through the buildings. Using a plastic wrapper is apparently the method used in films during the 1940' - 1960's to create the sound of fire, very effective. The sound is captured straight into the laptop with the built in webcam on a HD webcam.