Planning / research of soundtrack and / or sound

On review of the thriller films researched, the soundtracks used help create a feeling. In the film 'Seven' for example, the non digetic music used creates a huge feeling of tension and danger. This is created as the music is edgy with alot of jumps and screeches. The music I have intended to use is called "red rum" by the widdler. This song that would be edited to fit the shots taken, is in the 'dubstep' genre, containg heavy base that resembles a heart beat and synthetic, electro sounds that give the peice an edgy style that we intend to use that gives a feeling of danger.
Digetic sound used will create a sence of realism and setting therefore the inclusion of sounds such as, running water from a tap and footsteps will be included and carefuly looked at.