Looking for music for our thriller

At the moment we are searching for the most appropriate and effective music to go with our short thiller scene. The music that is needed has to build tension and suspense in order to have the audience on edge and to increase their anxiety. We have now created an account with mobygratis; which is a website that allows students like myself to download free music. At this moment were not totally sure if this website will be fully useful for our thriller because the music we've been listening too so far does'nt seem highly appropriate. Hopefully in the future we will find the correct music that is needed to have our thiller at its full potential.