Soundtrack ideas

When it comes to the soundtrack of our trailer me and will where thinking of using slow tempo music with a low bass and maybe heartbeats included. We don't want anything with a high tempo sounding like and action/adventure. We decided to do this because we are doing a horror film and horror films are normally slow temp to make it tense to attract the target audience, if someone liked horror films and it didn't intrigue then because the soundtrack was fast tempo and didn't make the trailer scary then the target audience will not be attracted to the trailer. The music needs to suit the genre of the trailer and me and will , will achieve this by doing more research on trailer such as paranormal activity , silent hill and other horror films.