Background Music (Contrapuntal)

This is that video that I have downloaded from YouTube. The reason that I have chosen this video rather than the official one is because that would be copyright therefore I obviously do not want to engage in copyright.
The reason that I have choose this song rather than any other song, to be honest there was no specific reason towards my picking of Imagine by John Lennon. I just had a feeling that when the killing was going on in the horror film trailer that this would fit very well. I wanted to use a low beat, slow paced song that would very much be classed as a contrapuntal piece of sound.