Official music video for the single "Experiment IV" written by the British singer Kate Bush. It was released as a single on 27 October 1986, in order to promote Kate's greatest hits album The Whole Story. The single peaked at 23 in the UK Singles Chart, simultaneously with "Don't Give Up", Bush's duet with Peter Gabriel, which reached number 9.The music video for the song includes appearances from Dawn French, Hugh Laurie, Richard Vernon, Peter Vaughan and Del Palmer.
The song tells a story about a secret military plan to create a sound that is horrific enough to kill from a distance. The ending of the story is unclear, but in the music video the people working on the project are killed by the horrific sound. The concept of sound being used to kill from a distance is somewhat similar to the sound weapon in the film Biggles: Adventures in Time, which was released the same year as "Experiment IV".
At the end of the song a helicopter is heard (the very same helicopter sound heard in Pink Floyd's The Happiest Days of our Lives from their 1979 album, The Wall) and a helicopter plays a key role in the film, but it is unclear whether these are coincidences or not.